Assuming this is about /Special:UserLogin/signup (as no steps were given), the request here is that the code should check for the user rights of the logged in user, and not show "Create Another Account" if the user has special rights?

All I know is I am WikiSysop and I am creating an account for somebody.
Something I do maybe once a year.

Well I look down and I see the button says "another", but I haven't even
created the first one.

Maybe after I create the first one, then say "another", but not before.

I guess it means "another" as in "other than your own".

Ah, no wonder!

But still bad, when a secretary, with a big sheet of accounts to
enter, scratches their head "But I haven't even started entering them".

In T91614#1091984, @Jidanni wrote:

But still bad, when a secretary, with a big sheet of accounts to
enter, scratches their head "But I haven't even started entering them".

+1. Interface messages shouldn't be ambiguous.

Change 237915 had a related patch set uploaded (by Siebrand):
Use 'Create account' for button in Special:UserLogin/Signup

https://gerrit.wikimedia.org/r/237915

Change 237915 merged by jenkins-bot:
Use 'Create account' for button in Special:UserLogin/Signup

https://gerrit.wikimedia.org/r/237915