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AFAIK, that feature has been available for some time (I've been using it, and can confirm that it works flawlessly). You can find it under Tools -> Settings -> General -> File Management -> Automatically save after every change.

and why is it not default? whats the use case here assuming there actually is a rationale

I think it actually might be the default. I can't remember changing that setting at least and for me it's on.

Xc does have that feature. Definitely a good thing

yea theres an option to save after every change