They wanted to make it the same as for consoles so you cannot do "proper" saves, it's just mandatory checkpoints. Yes it svcks. No they don't care.
I'm a big believer in that I should be able to save whenever I want, for any reason, because I might need to and I'm the best judge of that, not the developer.
They should AT LEAST have included a "Save and Quit" option that brings you back to EXACTLY the moment you saved and quit but no, another hamfisted design decision.
Darkheart