User blog comment:MisterWoodhouse/The first Unified Community Platform release is now live for NEW wikis/@comment-30017322-20200312235519/@comment-37336800-20200313182714

UCP at this point isn't better due to temporary loss of css/js, inability to transclude templates from CC, and the fact we don't have Extensions. After all that trickles back it's going to be a much better experience.

For example, on UCP you can filter Special:Listusers with the  url parameter (impossible to do on non-UCP wikis) and on UCP transcluding Special:Prefixindex returns a &lt;ul> instead of a table. Since there no old-style buttons (like the one used to post these comments) you can simplify custom CSS you have for button themes.