[int0x80]

I disagree. I found git checkout -b very convenient an intuitive way to say "create and checkout this branch".

For git branch -c one could say that the "branch" command should not do checkout-business.

[sametmax]

I should be a separate cmd. It's such a common operation, and it's a huge noob trap.

[nemetroid]

The reason it's a noob trap isn't that the two operations should be separate.

The issue is that "-b" (mnemonic for "branch") in no way suggests that it creates a new branch. Since checkout does so many different things, it would be reasonable to guess that -b limits the command to perform the "branch" action (i.e. switch to a branch). Git-switch doesn't have this issue.