Sorry 0ni I didnt want to appear rude and flippant.
I read this a lot.
"I wish I hadn't wasted my time on those little lifts instead of building my foundation on the big three"
In your 20's, well, in my twenties I wasn't thinking about lifting weight in my fifties, pushing it to 100%
What I know now is how useful machines are for building and maintaining strength and flexibility.
You can have as many injuries as you want throughout your lifting life but only so many recoveries and I've seen many men my age carrying many and instead of lifting they need to resort to calling these injuries *trophies* of lifting rather than realizing that they were stupid.
You don't necessarily have to Have regrets that you programmed the wrong template as goals change, many don't understand that weight lifting is a journey, not a destination.
I know this is the powerlifting section but exercise and powerlifter are two differant activities.