"I just want to make calls reliably with my phone. Don't want color displays and all in it".

"I just want my phone to make calls and send plain text messages reliably. Don't want videos and gifs and camera in it."

"I just want a smartphone to make calls, send sms, basic whatsapp and take average pictures. Don't want it to become a DSLR".

"I want my phone to just work reliably. I actually don't want it to be a full-fledged computer. "

Interesting you say that, because your phone is already much (, much) more powerful than the full-fledged computers from just a few years back. The only reason you don't want it to be like 'traditional' full fledged computers because it doesn't work great that way right now. Once it does, you'll not want your phone to become something else.

I'm not necessarily talking about performance but mostly about features.

For instance a lot of friends using Android phones are shocked about iOS lack of a global filesystem.

But to me, this absence is a feature, not a bug. Having every app sandboxed at the OS level is a great thing to limit what can go wrong. I explicitely don't want a global filesystem on iOS.

To be clear, I would hate a full computer without a global filesystem. But I'm really fine with a phone not having one.

(By the way Apple did take tiny steps towards a public filesystem on iOS and I'm not super happy about that)

So what’s the purpose of a “global filesystem” besides having a repository where you can store files and share them across applications? You’ve been able to use iCloud to do that and install third party storage providers that work across apps since iOS 8.