The best example I had of the same (started with Amstrad CPC, then Amiga, PC ... software engineer for almost two decades).
I couldn't find "Find on page" on iOS/Safari, so I did a Google search on how to so it - result snippet on Google was cut and actual results page was full page of forum replies, and I was having trouble finding it by just scrolling.
Now years later (and only Android) I forgot, it was something rather non intuitive where they've hidden that option.
It has zero ability to be discovered.
Its not good but so many people are decades entrenched they do not think about how annoying it is