[gpm]

My personal opinion is that it should depend on the situation.

If you leaving suddenly wouldn't cost society any more than you getting sick suddenly, I don't think the norm does any good. That's true of jobs where you're a replaceable cog (like a clerk at a store) with no need to transfer knowledge.

On the other hand if you're at a job where you have long lasting context, which it is painful to lose, it would be bad for society to have it be the norm that you quit without transferring that knowledge.

I don't think that this norm needs to be tied to the norm about how you're compensated (provided that you are fairly compensated, but if you're not, you shouldn't have taken the job in the first place), whether that compensation includes notice when you're being fired, or not, seems irrelevant to whether or not it should be considered your responsibility to give notice. The two situations are only superficially similar.