Source: about 12 years of Android usage (11 of those on unlocked bootloaders and custom ROMs, ~6? of those deGoogled) -> iPhone 16e.
For the first half, custom ROMs were a massive boost to the experience, but I never really bothered after 2018; You had to install so much of google's stuff to get anywhere near proper experience that it just wasn't worth it, and even then many apps were starting to throw a fit when they detected a rooted device.
And at the same time, the stock android experience from most vendors was now good enough. I didn't even check custom ROM compatibly for my last Android two purchases (both Samsung). But it was nice to have the option of rooting and maybe finding/making a custom ROM Samsung removed that in their last update to One UI :(
What was it? Personally, the only thing I miss from stock Android is the Google Wallet/Pay/Wallet. (I do use microG to get push notifications and embedded maps working.)
Once my ability to run a "background spyware-less" Android device went away, so did my willingness to put up with the negative sides of the usability tradeoff.
Apple probably sends some telemetry home, but at least their business model doesn't depend on knowing the exact Pantone color of the food I ate for dinner to market a matching wall paint to me.
Edit to add: oh, yeah, you mentioning 3P apps complaining if they detected root or MicroG reminds me of many a horrible night of debugging. Ugh. What a mess.
Apple already have a huge chunk of the ad pie and are growing all the time. Dont think Apple are keeping you safe from ads and all the profiling of your behaviour that involves.
https://www.businessinsider.com/apple-gets-serious-about-its...
https://www.wired.com/story/apple-is-an-ad-company-now/
https://www.bbc.co.uk/news/business-67417987
https://www.businessinsider.com/apple-tests-ai-app-store-ads...
Apple is not some magic solution to the question of on-device privacy. But compared to Android, the improvement is night and day.