DMs are now accessible by the menu bar on the bottom. Before it was at the top of the server list
user list is now only accessible by pressing a button on top of the screen
swipe on a message to reply to it.
colours have been tweaked to be less contrasted
As for my thoughts:
IDC about DMs
I look at the user list more often than I reply to people, so I rather swipe to see it. Even more than before, replying only needed a long tap on the message that would be in thumb reach, and now you needed to stretch out your thumb to reach the user list button (that is a search icon)
I don’t suffer from any particular contrast eye issues, but for those that does, contrast is pretty important.
No communication. This update breaks a lot of muscles memory, and it’s forced upon you even if you don’t like it. The old UX was completely fine too.
desktop/mobile discrepancy. Before, mobile was a lot like desktop, but now some thing are moved and you need to learn two interfaces
There is talks that it’s more buggy and slower than before, but I can’t objectively prove it
If you like the new ui, then that’s great. But there’s clearly people who don’t for great reasons.