~22 years of daily Emacs on MacOS, and never encountered (or never noticed) it, either. Perhaps a build issue. I think my Linux builds may run slightly better, and Windows slightly worse, but I haven't had a problem on Mac in decades.

Thirded. I don't doubt that some people have problems with it. Software that runs on lots of differently-configured and -maintained systems will do that. However, I don't think that's the common case. I wouldn't say I've never had problems, but they've been rare and minor inconveniences at most.