fcitx is deprecated. fcitx5 is recommended.
Development of fcitx has stopped, and development has shifted to fcitx5.
Therefore, I think fcitx5 should be recommended for manjaro-application-utility.
Since I use fcitx5, I think this is a better confirmation of the current situation. My guess is that there are no users of fcitx (no number) in my language. It’s ambiguous.
I installed extra/manjaro-asian-input-support-fcitx very recently. I hadn’t noticed it for over three or five years (and it was working fine). It’s just an environment variable setting, so it’s not really necessary. maybe.