What tradeoffs does Gatekeeper force you to make?

>unsigned apps, though, will bring up a warning dialog box and make you acknowledge that it’s not Apple’s problem if the app sends your address book to a Russian bot network and fills your Documents folder with “My Little Pony” porn.

I wouldn't call that a warning box. It just says you can't run it, with no alternatives suggested. (There are alternatives, but you have to know them already.)

https://www.steinberg.net/fileadmin/redaktion/Supportteam/32...