You are right, you do not have to be in domicile for a long call assignment, you don't need to be in domicile for a short call assignment either.
Let say you live in MKE and can drive to O'Hare within 2 hours you are good.
But the company has been clear, you better be in domicile by your report time. So if you are long call and they call you at 5pm for a 5am report time and the last flight of the day was at 4:50pm and therefor you cannot make your long call assignment you could face loosing your job over it, and we have seen that during covid, lots of people have. I've been trying to get a clear answer for the company on this very subject as i was a Florida commuter and just could not bid long call for that very reason, my last flight out West Palm was around 2pm. It's different now, i can make it with FLL, MIA, PBI, MCO or i'd just take FedEx or UPS.