In my many years of having bikes with internal gear hubs, some new and some decades old, I've never had a single with them.

The internal gear hubs have been perfected before derailers even became a thing; it's a very mature tech.

You can[1] do some maintenance on them. I don't have any experience with that, as all my internally-hubbed bikes were stolen long before such a point :-) :-(

[1]https://www.sheldonbrown.com/internal-gears.html