@btyler101 For front plate raises, again using the example you showed. The user is using an overhand “clamping” grip, as opposed to using the handles on the plate. That’s specifically how that type of workout affects grip. Also, front plate raises usually require more weight than what I was asking about in my original question. It’s not a dinky amount of weight at that point 35 or 45 lbs held straight out without a firm grasp on a handle.
My only suggestion for you, if you are skeptical about a workout is to give it a shot. I mean, the whole point of me asking my original question was to satiate my own skepticism. Working out is subjective, a routine that I like and recognize works for me, Is not the same routine that I would suggest that my wife does, and it wouldn’t be the same as the routine that I’d suggest for you either. But if you’re curious about the effectiveness of a certain workout, there’s no harm in trying it, unless it’s wildly dangerous and beyond your skill level.
You’re partially right, “muscle bound” isn’t actually as true as people used to believe, as in you would limit your normal RoM if you never stretch, but as someone who used to practice jiu jitsu on a regular basis, stretching and mobility routines do great things to minimize the risk of accidental hyperextension and improving comfortable range of motion.