> you become a risk when you give notice, and are cut off from company resources immediately.
which sounds like to me a carte blanche permission to not do any more work after giving notice if that happens.
Well yes, in addition to being cut off from resources, you're generally asked to clean out your desk and enjoy your vacation. Some places will immediately escort you from the building.
Sounds harsh if you're not used to it. But it makes a lot of sense within the industry, and no one's feelings get hurt in practice.
In many places and industries, you become a risk when you give notice, and are cut off from company resources immediately.
This is most visible in the financial industry, but I've seen it elsewhere too.
It's not really a big deal. Everyone understands it, and you just adjust your communication choices accordingly.