Many people don't care about Privacy, Ecology, etc... yet it will have catastrophic consequences down the line.
Similarly here, yes it's true people don't care about the web engine, yet given Mozilla situation and Microsoft who switched to chromium, the web is seriously not in a good shape and it will have consequences on the long term.
Bugs present in iOS browsers, won't be present in Android browsers even if the browser version is the same which makes debugging harder.
For example, it turns having 3 targets (Chrome, Firefox, Safari...) into 5 targets (Chrome Android, Chrome ioS, Firefox Android, Firefox iOS, Safari iOS).
Differences between mobile/desktop browser are relatively minor in comparison.
On the Chrome side, there's fragmentation from all the browser that just wrap Chrome like Samsung Internet and QQ, but those are greatly mitigated by having up to date apps or are region specific so won't apply if your business doesn't do business in China.
If that's all they wanted they would buy an Android.
> PWAs let companies skip the app store and therefore skip paying apple 30% of their transactions which means cheaper prices for users.
Exactly, this is what this is all about: companies wanting to milk users for more money and maximize their own profits, not that they actually care about the users.