Depends on what your threat model is. Sure a fully locked down mobile OS is more secure, but I also care about freedom and privacy. It’s not all black and white.

Culture. For the same reason why in american music every swearword is beeped out, which seems ridiculous to everyone else in the world. It’s just how it is.

Depends on your security and feature requirements. I found that Mega works well for music streaming on mobile, and the E2EE is reasonably trustworthy for that use case.

Did someone call me?

No.

I think it never got much adoption because nobody knows how to pronounce it. Has been around for many years but I’ve never seen it in action.

Seems that his critique was absolutely justified.

The only real solution is to use E2EE, which there are plenty of options for with XMPP.