> One repo uses `master` but a subtree uses `main`. If you make a mistake and checkout `main` you end up clobbering your whole working tree with the subtree. I

> One repo uses `master` but a subtree uses `main`. If you make a mistake and checkout `main` you end up clobbering your whole working tree with the subtree. If you replace checkout with switch/restore, that foot gun goes away.