I'm by far no beginner when it comes to lifting. I'm a huge fan of Dimas, we all cried when he retired (he writes for a news paper now).
By the same token that you can show someone like Dimas or Chakarov doing a no, no, no squat with INSANE weights is similar to posting up an NBA All-Star as an example of a basketball player and possibly relating to how high a basketball player can jump. You can't use an All-Star as an example.
If you want to use a sample of squatters, let's not use the top .0005% of the squatters in the World as an example. Lets use the top 10% at least and say that a decent squat suit or briefs will help with the protection of the hips in the squat lift. For the majority of HARD squatters (and especially those using a wider stance) a pair of briefs will for sure allow them to squat with intensity for longer periods without injury or hip pains. I hardly ever get hip pains from heavy hard box squats but that is just me and it is rare. (I box squatted an easy 682 a few weeks ago with loose belt only, below depth).
Squats are a supplement exercise for my sport as well and I FULLY see your point about suits and shirts. There can be a line between protection and HELP. I'd like to compete in a powerlifting meet in the next year or two and I'll be wearing the MAXIMUM allowed for sure!
Been using the shirted bench press to greatly help my overhead press lately with great results too. Shoulders and chest are not taking a beating and it is frying my triceps!!!!!