Comment 3 for bug 1778503

If users have to use autocomplete, then why it's not an input field with drop-down filtered list?
When lists have height of a few screens without fast scrolling - they are useless.
If you don't want your users to use mouse, but use autocomplete - make it in this way.

Indeed, auto-complete may be a faster way for input. In case you remember all the categories, i.e. you are using this program for a while. In case you are a newcomer, and just learning the program, and do not remember all those categories - autocomplete will not help at all.

Thus, you just piss off new users from your program.