FluffyChat also has quite nice UX and a bubble layout by default, but threads are still a while off [2]. On iOS it worked flawlessly through the iOS 16 betas while Element had some show stopping bugs, a couple of my friends moved over if they were on the beta.
I haven't had any friends ask me about the verify session buttons. I don't see any prompts on latest iOS Element but it's still too prominent on Element desktop for my liking.
SchildiChat [3] is my daily driver and feels more friendly than Element on desktop (unified DMs & group chats, no verify UX, chat bubbles), but it doesn't have any update mechanism built in, so I'm wary to recommend it to non-technical friends. It was also my goto recommendation on Android before the Element redesign.
I'm confident the ecosystem is moving in the right direction though, and so thankful for the amount of choice.
[1]: https://github.com/vector-im/element-x-ios [2]: https://gitlab.com/famedly/fluffychat/-/issues/881 [3]: https://schildi.chat/