assuming you commute company business to work.

while I can use COBUS 99% of the time, there are times of day which if they call me for a 12:01 callout I would have to take an offline JS or drive to make it to work.

while what you say is true, depending on your commute and flight schedule it may not be smart to be in a position on reserve where I need to take a flight to get to work and be incapable of taking the jumpseat. Especially if I am on deck on the RAL as Tennisguru’s comment was suggesting.