But for people like you who primarily talk and text, switching then becomes easy and makes tons of sense. For people like me who value customizability, and for whom talking and texting is only a small fraction of phone usage, switching becomes less of an ideal solution.
I switched from Android to iPhone a few months ago because of hearing aids, and I can tell you that it takes getting used to, even just for calling and texting. Notifications are different, setting of preferences is different, and often less flexible (e.g. you will get phone keypad tones, unless you silence the phone with the physical slide switch), navigation within and between the built-in apps is different.
For most people, I think, the same adaptability that would get them through those basic changes would also get them through the app transition. Most of the Google apps are available for iOS. Would probably have to spend some money on apps too. The App Store model seems to be a free app that’s very limited in function, and an in-app purchase to upgrade to a full-function ad-free app.
So, I might still suggest switching to iPhone, to anyone who posts on here and seems like they’d benefit from it for hearing aid use. Excluding you, of course, since you’ve made your priorities very clear.