Ahhh, premature optimisation! You've optimised for your time, but have you optimised for the best efficiency at the company level? Ok, so your precious flow doesn't get interrupted, but the person that had a question that needed your input now has to wait around until you deign to respond.

You know who doesn't work that way? Fabrice Bellard. If you're lucky enough to be his co-worker, you can sit down next to him and ask a question at any time, and he will stop what he's doing and answer you. Then he'll get back to work.

The attitude you expressed above (and it's far from uncommon here on HN) is just an example of developers wanting to be treated like special snowflakes. I do not believe this is a desirable trait for someone working in a company.