It's a matter of investment. I do not see anything fundamental dealbreaker in Wayland's security model to support and enable accessibility. It probably just needs investment in engineering to find correct interfaces and ways to do it.
replyTouch goes in there as well. I don't know how they add a new touch keyboard to KDE and have no access to arrow keys. Making it impossible to go up in the terminal.
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Oof, please report that as an issue (if it hasn't been done already). KDE uses https://bugs.kde.org
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