The problem is also that meetings and answering emails is much easier than deep work and therefore they are highly attractive procrastination pastimes.
Ugh. I find them incredibly draining. While if I can actually code for a few hours uninterrupted (this includes self interruption), I find I have so much more energy. Maybe it's the self congratulatory mind manipulation I play on myself when I'm productive. On the other hand, meetings that I have little stake in just exhaust me and derail my ability to focus for the entire day. This may be an ADHD thing though.