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You already can sort alphabetically if you want by clicking on the relevant column. I think the current sort by number of edits is more likely to be useful, and it isn't "unprofessional" in any way I recognize.

I know i can sort by clicking (and this i did, but why for). When searching a tag i usually have its name referenced on a page and i need to know what it represents, so i prefer to have immediatly the alphabetical sorted column than a 'number of edits'; more of that it is the first one, the one reading starts with.