In my experience they answer less than 50% of the time, and always after several days when it’s often too late. And just like when you text/chat/email for customer or tech support at various companies, they’ll often send a scripted message that is unhelpful and not responsive to the question asked.
I do find that the chances of receiving an answer increase if I forward the original email (always cc yourself) and say something like “trying again,” or “maybe this didn’t reach you the first time,” etc.
I wish they’d at least have a few email addresses, one to use only if you’re on a shop and have an urgent issue (and can’t reach scheduler or there isn’t one), one for pay and taxes, one for tech support and one for everything else. Maybe they think that’s too many for us to keep track of, but if they had the links on our shop log it would work. It wouldn’t help their personnel issues but might save a bit of time on their end.