To me part of this great sport is seeing the birds home, calling them down and clocking, doesn't matter if ets or manual, I wouldn't enjoy the race if I couldn't or didn't want to be there.
When a bird comes home can you guarentee its going to come straight in over the pad and not sit on the loft etc.
To me the only time i'd be happy or want to leave the ETS to get on with it is when we get holdovers and the birds are liberated on a work day, but it wouldn't be the same as seeing the bird shut its wings and dive for home! JMO