I don't think it matters. You can get bigger and/or stronger training with or without a pump.
What I found interesting is that, when I trained legs in 20 minute sessions during winter of 1987 mainly doing nautilus supersets of leg press and leg extensions which left me hardly able to walk down bus stairs due to severe pump, my standing long jump improved 15cm without any athletic training over a period of 3-4 months.
Now theory says power needs this and that (heavier training and long rests), but in my case, I made my best ever power gains, in terms of time frame, doing the exact opposite (high reps and short rests).
I honestly believe that, with so many variables with strength training, it is almost futile to define a perfect methodology for training.
That is why there are so many champions who train differently.
Again, whether you follow a program, train yourself or are coached, what matters is when to push and when to back off.
This not easy. It requires you or coach to observe one's body in terms of necessary recovery, along with proper diet. Some people are workhorses, some need less training.