I'm starting to think I need to do some closer examination of the grabbar at my den steps, no other railings. Installed by/for previous elderly owners (both deceased prior to my purchase). The bar always held when I used it, but I've also noticed a little sideways wiggle in it at times, so always been careful not to pull on it sideways. It's close to a corner edge, but wall is sheetrock covered by spray coating-den used to be the garage before the former owner appropriated it as his mancave, based on evidence still in the house when it went up for sale.
A lot I've learned about home construction through owning this house-and that's a good thing, tho the ways I learned weren't always. Previous owner-husband did a fair amount of jury-rigging in this house that I've had to have repaired/replaced over the years, as the juryrigs were discovered post-purchase, one repair was quite costly. One of his other jury-rigs nearly killed me before I knew there was a problem-but the story of how I discovered and miraculously survived that boobytrap would take too long. I'm not as good a storyteller as PO and wouldn't do that to his thread anyway.