I had trouble with 5x5 when starting out. It was billed as simple and foolproof, but my form was lacking. I am hyper-mobile, so this means I really have to train proprioception, and probably not make the most gains in the shortest amount of time.

This is something I didn't know I didn't know, and I had to learn the hard way. It doesn't mean 5x5 is bad, it just didn't fit for me when starting out initially. Lifting forums have a tendency towards the idea that, "you aren't special, just do these things" because they have a lot of people descend upon them with too many questions.

But sometimes things aren't working, and you need to adjust.