My 70 year old relatives seem to have no problem finding the setting that makes everything on the phone 2x bigger. Probably because Apple is good at this and offers it up as an option in the OS onboarding and after every major update.

It’ll be fine.

On Mac OS the first significant thing on screen after turning it on for the first time are the accessibility settings with screenshots and animations to explain every option. You can also access those options with the Spotlight search, typing "tran" will give you the "reduce transparency" toggle directly in the search results without having to open settings first (though to be fair the search indexing is a bit lacking, like on iOS - the animation toggle is called "reduce motion" and so it can't be found via typing in "animation").

Apple designs stuff this way on purpose. They think it's neat to "discover" something that should be obvious. The new camera app is a perfect example of this. No indication that swiping up from the bottom brings up a menu for camera controls. The fact any of these obviously terrible design and implementation choices are praised is baffling.