I agree with the public spaces. Just put https and we’re good.

The worst part of Matrix is needing to copy recovery key onto each new device or install, or else you will lose access to all your messages in public servers. Its been discouraging and I rarely use Matrix because of this inconvenience, but I really want too – it’s too exhausting and time consuming. And I lose track of conversations if I lost the key, which isn’t practical if I’m working on something.