[darkwater]

And this can be easily solvable by swapping the Sign up for Sign In after the first time you logged in a browser cookiejar. Obviously the devil is in the details, but it shouldn't be that complex having a visible Sign Up for potential new users and a visible Sign In for existing users...

[imhoguy]

Please don't! The worst thing is to swap meaning of a button at exactly same placement. If you are forced to do it then at least change background color and add some icon etc.

But nothing can beat MS Teams "Close" document preview button, which once clicked, uncovers chat "Call" button. Add some laggy nature of Teams and you call the entire channel/chat just by trying to close an opened document with too many clicks.

[darkwater]

But that would not change "immediately". Basically if you never logged in (in that browser) you see the "Sign up" more prominently and once you registered, you are already logged in (so you don't see anything at all) but if you do log out, then you would see the "Log In" clearly (and the "Sign up" will be somewhere also but not in the best spot).

[johntash]

This could make it even more annoying imo. Sometimes the sign up button is the first thing you see, and then other times its the sign in button. You'd end up clicking on one or the other out of habit and realizing it was the wrong thing afterwards.

If I'm signing in, there's a good chance there is no cookie saying I have ever signed in.