Can you name a service you think works like that?
replyGoogle have over a billion very non-technical users.
The friction of not having this in the account page that everyone has access too probably saves both parties lots of heartbreak.
github? I just do some click here, click there, copy paste and gh cli is ready.
replyFor google I need PhD to setup any kind of API access to my own data. And it frequently blocks you, because you can setup as a test product, add test accounts (but it can't be owner account (WTF?)) etc.
I gave up on using a google calendar cli project because of all that lack of normal UX.
UX for google APIs looks like it was designed by accountant.
gws auth setup looks promising, but it won't work yet for personal accounts.