That is a solved issue and has mainly to do with a badly designed connector and has been resolved since the late 2000s. Glued in batteries don't use any other connector than batteries that are glued in. And if your case isn't designed like shit a drop should not open it.

Try it with a modern Fairphone for example. I had one for years and not a single time the back lid fell off or the battery disconnected. I had a couple of batteries die in phones tho. General point: If you argue with people who have more experience on an issue than you, bring the receipts and red-team your own statement before you make it. Everything else doesn't really shine a good light on you.