[selfhoster11]

How do you imagine budget or mid-class 7 year old phones running a new Android release? The specs are too weak.

[hulitu]

I would say the bloat is too big. The difference between Android 2 and 9 is some fine grained permissions.UI is the same.

[selfhoster11]

I agree, the bloat is significant. To nitpick, I'd say that the UI has actually worsened between 2 and modern versions.

[remram]

You expect that none of Android would work but all of K-9 should work?

[selfhoster11]

Yes. K9 hasn't bloated much over the years, and I've been using it for the past 10 years so I'm quite certain of this.