Our work is very collaborative and being able to get quick feedback on some issue is nice.

Having to ping them over chat is annoying because while it may result in a quick answer it may also just disappear into the ether (or the chat app fails to deliver, the person steps away but you don't know this, etc.).

Again, our work is collaborative and if someone wants to be left alone they throw on headphones in which case everyone knows to just ping them over chat so they can respond whenever is convenient for them.