I think in my case it has a lot to do with my stylist.
erplexed I was getting about 1 track sewed in halfway down the back of my head, and that whole section of my hair just started breaking off BIG TIME, and each visit I'd ask if I could see my hair length BEFORE she started putting in the track, so I could see my natural length, and she just always happened to forget or be busy or distracted, etc., and then the very last time I went to her I had a bad feeling about my hair (I had noticed a difference at home when combing my hair and trying to put it up in a bun, back half of my real hair was short as can be and couldn't even be gathered into a pony anymore
), and so I told her I NEEDED to see my hair naturally this time. And I was super adamant about it because she kept trying to avoid it and instead suggest I let her braid it up into a full weave. I wasn't having it, I could tell she was reluctant, and finally when I saw my hair.....
the whole back was about missing. I had started getting tracks to GROW my hair, but ironically enough I had ended up with much shorter hair in the back than when I started. I was so upset I decided that was the last straw with not only relaxers and sew in hair (for me), but DEFINITELY with that stylist since she had proven herself to NOT be out for my personal hair benefit but to make money on my visits.
So yeah, I think a big part of what happened to me was my stylist not genuinely wanting to help me hair-wise. I've found that to be the case with most stylists, though. I've lost faith in them, tbh.