- I noticed when I registered that it rejected my usual username as invalid. Now, usually, when people register accounts, if the username is rejected, it almost always means "it's already taken, try another". Whether correctly or not, people are basically conditioned for this. Well, it turned out that this rejection wasn't for "already taken", it was for "You didn't use all-lowercase". What is this, 1976? Just toss some automatic toLower's in the backend and be done with it. (I'd say "unicode-defined case-insensitive string compare function" instead, but since only a-z are allowed anyway, any code-points outside plain-ASCII are inconsequential. Although really, unicode or not, even an [a-zA-Z]+ requirement still seems a bit restrictive for good UX, especially since name collisions are (correctly) rejected.

- The whole requirement on new users to choose BOTH a KDE Identity "username" and then a separate forum "Display Name" (that *sometimes* is allowed to be the same, but is subject to a whole *separate* set of potential name-collisions and therefore can't always be chosen as the same), comes across as very weird and confusing. Just assume new users don't even know they can have them be different (likely a very safe bet), validate their requested username against both lists, and let the power users who know about the possibility for different username-vs-displayname opt into it in their settings if they really want to. (And again, either go case-sensitive or case-insensitive, but "error: I can't handle both upper- and lower- is soooo "mainframes and Apple 1's").

- When I went to provide forum feedback via "Forum Feedback", I was presented with a binary choice: " I want to… A. Ask a question about KDE software or B. Ask a question about the forum.kde.org website". Feedback isn't a question (and even aside from that, not all new threads are necessarily questions), which causes this dialog's wording to be rather awkward UX. Especially since precision IS requested for other distinctions like "bug? or other feedback?".