I definitely try to hold something back coming off a low point/deload. You have to have room to progress, and the fortitude to keep going long enough to make progress. If I push full boar I can literally blow my load in 3 training sessions going all out. Some guys don’t know how to push, but as you age and strengthen and become a better power athlete, your ability to dig deep will eclipse your recoverability without a doubt.
But progress doesn’t come from training as hard as possible anyway - it comes from consistently doing enough to practice and get the stimulus. If you listen to Louie discuss the ME Method, maxing weekly, it’s all set up to still allow continued training. If they hit a comp lift to failure, even a rep max, weekly they would fall off fast. Doing lifts that require less weight, short rests, only 3 total reps at/over 90%, all help limit exposure. And even then 2 of their 4 training days are heavy like this. The other 2 are more feeder and technique.