> If you don't pin your third party flake urls they might also change under your nose as you run the same command again a day later. That's what flake.lock is

> If you don't pin your third party flake urls they might also change under your nose as you run the same command again a day later. That's what flake.lock is for, it remembers the versions picked. No need to put versions in the flake urls just for that.