Similarly, I've never heard normal people complain about or discuss the CPU speeds of their smartphone.
Companies will always harp on each others products when they can, and the tech press writes about it because it gets clicks; no conspiracy here, I think.
However, the biggest "customizations" I've see were changing the font to a nigh unreadable one and to install apps they didn't pay for.
I used to hang around the Dreamcast homebrew scene and the stance on emulators were that they were mostly a proof of concept/educational thing so you could talk about the emulators, how well they performed, bugs, etc, but you couldn't talk about where to get ROMs or distribute emulators with ROMs on the site.
I don't know how that'd work with iOS apps. In order to keep the emulator app separate from the ROM, you'd need to be able to download the ROM to some sort of general storage. Then the app would need to be able to access that storage. I guess you could do it off of dropbox. Point the emulator to some URL where the ROM is stored. Downloads the ROM on demand, etc.
The major point is that the app can't really have somewhere official that says "ROMs be here".
I saw on Facetagram that Samsung phones plummet out of airplanes almost twice as fast as iPhones.
If I drop a grand on a mobile phone, it has better be the first one to the ground!
What's next? "The new Galaxy S12 can reach ignition temperature within 5 seconds of power on. Beat that, Apple!"