SteemConnect is the trusted way to connect apps to Steem via Steemit.com access. It means the guys at Busy.org never need to have access to your key directly, like the way OpenID works. It looks they've updated to show you exactly what the posting key can do so there has been no effective change, only a UI change.

That's what logging in is so if you don't want to log in you can just not log in and continue using Busy.org without being logged in.

But I agree that there should be an option to choose between permissions. That is for SteemConnect to implement however, not Busy.org