It looks very plausible that stretching before you exercise doesn’t do much for you. Multiple older surveys suggested this.
Annoyingly, the studies linked in the previous paragraph are 2 decades old, and somehow I can’t find a large, well controlled, trial.
love to hear it. muscles are definitely akin to springs - stretching them out before a lift or sports can limit your ability to perform. powerlifting and mobility are incredible tools for longevity and it sounds like you found the right combo.