I've never seen an Android phone do anything that I can't do on my iPhones.
Download any files directly from your browser to a physical file system without using 3rd party apps or the cloud?
Plug the phone into almost any device and transfer files using a file system, any files?
Set an audio file as a ringtone or alarm, without using third party apps?
Customize your home-screen, not just the wallpaper, install a loader, deep customization?
Split screen multitasking?
I'm not saying you can't, could or would want to, I'd just be surprised if you could.
As for ecosystems, I don't use that word in relation to computing usage, I don't really think of it as an ecosystem rather than multiple platforms.
An ecosystem conjures visions of effortless harmonious balance.
I just want things to work how I want them to work, to hell with harmony, I'll force things to work they way I want, if it involves a little thought, so be it.
That said, I use an android TV, PC and android tablet and phone, primarily.
I had an iMac but sold it, it wasn't my cup of tea.
As per the theme of the thread, I would never limit myself to one system.