The body will recruit the higher threshold MU's if you do reps as well though. There is nothing special about DE in this regard. I think chains are certainly useful but the question really is "when?". I dug out a few quotes:
"I do like bands and chains when they are applied to specific problems (not necessarily a blanket prescription). Speed work is good in theory, but for many don’t need it at all and of those that do, they probably need it to be heavier than recommended." - Mike Tuchscherer. Unfortunately he didn't go into more detail although he has said that people need to flatten their force curve with reps first and foremost.
"I generally do very little lifting with bands at this point. I did much more when I tried to mimic the various westside training ideas I had read. But I’m not really sure I benefited from it much.
As a raw lifter I find that focusing mainly on the bottom of the lift by training with straight bar weight and lift variations that use extended ranges of motion and/or pauses are most helpful. Bands tend to be effective at overloading the top of a lift.
For bench I will say that I don’t use bands but will sometimes use a slingshot. For deads I occasionally use them for sumo, but they are very stressful and I’m not convinced they are very effective. For conventional pulls I like them, however, and this is because they teach you how to pull the weight past your knees using your glutes and hips and hamstrings. Pulling off blocks can be awkward conventional as you can start in an unrealistic position. For sumo I find blocks very helpful because the position in the back is fairly similar to a full range pull. For squats I just squat straight weight. For added strengthening, I front squat or squat high bar with a narrowed stance." - Dan Greene
"I believe bands and chains certainly have their place in training. But they are not a major factor in my program. If I have enough time for a 16 week cycle before a meet I will use bands for one 4 week cycle (3 weeks heavy/1 week light). I don’t use chains because I haven’t lifted at a gym with chains heavy enough to serve their purpose and since I travel a lot it is easier to pack my bands around. The main reason I don’t use bands is because when training raw – there are other manipulations of the lifts I like to do instead of accommodating resistance. And when training in gear – I’m too focused on adapting to the gear and free weight. With that being said; I have had very good results with bands but people tend to overcomplicate them." - Blaine Sumner
"I typically have always trained with just straight free weight and never really thought of using Chains or
Eric Lilliebridge’s amazing 2204 total, raw at 275, has been built largely without the use of any accommodating resistance.
Bands in my training before because of the great success I had made without them. I decided to try out Chains for one short training cycle on my Squats and Deadlifts just to try it out because I wanted to work the top portion of the lift harder and make my lock out stronger on them both. The most we ever used was 50lbs of chains (25lbs per side) so that when you fully stood up with the bar out of the rack, the chains were all the way off the ground hovering about an inch above it, and when you locked out the deadlift they were about half inch to an inch above the ground as well so that the full amount of weight from the Chains was loaded at the top. I did about a 6 week training cycle with them both (3 heavy squats, 3 heavy pulls, alternated every other week) and by the end of the training session I could tell my lockouts were a lot more powerful than they were before and ever since then my lock out on the pull has felt very strong and same with lockout out the squat. The chains definitely helped build some stability on the squat especially if you’re not used to having hanging weight from the bar. I know that a lot of guys like using heavier amounts of chains (100lbs and up) but I figured i’d have the majority of the weight from free weight and just enough weight in chains so that when I hit the bottom of the squat, maybe only 20-30lbs was taken off of the bar when the chains were hitting the ground and for the deadlifts so that the extra Chain weight loaded up fast as soon as you got it to knee level. I would definitely recommend using Chains in your training if you feel like your lockout on the deadlift has slowed down and same with the top portion of your squat. I will probably end up using Chains again in my training at some point whenever I feel like I need them again!" - Eric Lilliebridge
"Since becoming more advanced I have gotten further and further away from this way of training and have realized straight weight and differing rep ranges work far better for me. I became a better lifter because I took a step backward and trained with a more primitive method. I feel that if people try to milk using straight weight with a power bar more and more, and stay away from these tool their strength will only improve because if it. That being said I do still train from time to time with bench and chains." - Brad Little
So the biggest thing here is that at some point in their training these guys feel like reps and max effort work are not doing the job and then they bring in the bands or chains. I'd really like to know when this moment is. Eric Lilliebridge stated it helps his lockout and he is a VERY explosive lifter despite only relying on straight weight for a long time. RFD is just power. I don't see many power athletes utilise bands and chains at all, olympic lifters are incredibly powerful and train with lots of powercleans and powersnatches. Sprinters do lots of sprinting and powercleans. I don't see how the powerlifts should be trained any differently raw.