First thing. i don't mean to be dogmatic at all. if you hit it consistently, track your progress and keep learning just about any program of approach can be made to work. it's all just tools we're talking about, you might find a tool works for you that doesn't work for me.
WRT weakpoints: While it is possible to understand where a weak point is and strengthen it, in general the doing of that movement will sort itself out, in most cases it's not a strength deficit in one place, it's a deficit all over.
This isn't to say at a certain point a person's particular leverage won't dictate they do something different to address weaknesses. longer limbed lifters may benefit more from certain accessories (like hamstrings, triceps grip and calves) or working on the hardest parts of the lift, (pause squats and lockout work) but linear p is not that point.
Geared is a different beast. Compared to raw, gear makes the bottom of the squat feel more stable and "easier"(a very very relative term). Think of this almost like the difference between rack work or partials and full range squats....it's very different. that said, good geared lifters I know do the same training as raw lifters most of the time. They squat a lot press and pull a lot and as they peak for a meet, (8-12 weeks out) they begin working more with gear.
There is nothing wrong with doing accessory work even at a relatively novice stage, even elaborate stuff with bands and chains etc.they are just tools. But it can be a snipe hunt trying to find that one thing that will "fix" your weak point if you aren't experienced in how each tool works and for what and how. If you're doing LP, now is not the time to waste your energy figuring out bands. If you have a good coach, they can do this because they've seen how it works, you should be busy learning to squat.
I will say, IME, there are a few very good "accessory" variants of the lifts that are pretty foolproof and seem to benefit everyone, even beginners. Doing these variants for as little as 3 sets of 3 at the end of your session can be really helpful.
squats: 2 second pause squats
dead: deadlift standing on a plate (deficit dead)
bench: pause bench and board presses
press: push presses