FWIW: I've had no issues whatsoever with my side seat trim pieces, after having each side on/off several times. Once I figured out how to reinstall them (inserting the top tabs first), it went smoothly and created a tight fit. The response to this thread suggests it's a common problem, however these postings are the first I've heard of any issues. That said, maybe I've spent too much time living under a rock and I'm woefully ill-informed (lol; just joking; I spend too much time on this Forum...just ask my better half) or perhaps these concerns are just now being voiced?
On the other hand, when I had much of my car interior apart to install sound absorbing/dampening material, I noticed some of the panel clips could be crushed sideways if they weren't properly aligned when trying to reinstall, and if too much pressure was applied. I could always bend them back into place, so they were functional. Sometimes I used a small mirror extension tool, to view the alignment, before pressing the panel back into place, when it was a tight space and difficult to see what was going on. I didn't find that necessary with the side seat trim pieces.