When I have had changer mishaps, usually what happened was that, while the needle was still on one record, the changer dropped one or two records on top of the tonearm. The big looser was always the record under the needle which usually got a terrible scratch or gouge. After about the third time something like that happened for me, with different changers, I stopped ever stacking records, and decades have passed since then.
Maybe I would stack records again if I had one of those 1950s dedicated changers for 45's only. 45s are a lot lighter, and the kinds of 45s I'd buy would probably already be in bad shape. I would probably only buy them to demonstrate the vintage changer with. I'd probably be running a ceramic cartridge that took 5-dollar replacement needles, and I'd have a couple of spares handy.