this all rings true for me.
youth and desire used to be enough to do it all. Even then, i tended to specialize when I should have been training more generally.
Now, I need to start specializing so I can get the reward of being very good at something, but not hurt or overextend myself by trying to do it all.
Progress also S-L-O-W-S down significantly. Trying to fight it ends up wasting more time.
I went from linear progression last year and was adding 40-50 lbs per month...Now that I'm closer to my limits I'm doing less overall, I'm adding 10 lbs per month and only adding a few reps per month to big lifts then starting over (with new weights) every 4 weeks.
Should have done this months ago, but had to understand that, at age 39, the rules are starting to change.
the secret is this: For experienced lifters, it's not the workout that drives improvement, it's the recovery.