Personally the Slack UI is very not "natural" for me, both before the redesign and after with new desktop UI. The iOS app feels better in the new version, but also something is very not consistent with my experience with other apps.

In the desktop case, for some actions (like leave a channel), I have to click on every element which looks like it clicking it would open a menu, until I find the right menu with that option.

On mobile, I find it very difficult to navigate quickly between channels/DMs, and always have a hard time when trying to open a "DM with several people session". Both a new one, and finding one I know exists in my history.

Their UI is not my cup of tea either. I find browsing channels and the way personal chats are listed not to work well. I've also seen a bug numerous times where the UI shows a notification for a message when there isn't one but that's not a UI problem per se

I am curious, it says it loads under one second but doesn’t on my computer, does it load that fast for you?