Regarding gralloching - from a point of view of someone who both attends driven boar hunts as well as organizing them. Valid for private hunts among friends, not "paid" hunts.
Recovery, transport, gralloching, etc. is part of the hunting - not the shooting alone.
I expect anyone to take care about the game he shot: make sure it is not left in the forest, make sure it is dragged to a road etc. You don't have to do it by your own, just make sure it is done. Same with gralloching: be prepared to do it and have knive/saw/gloves... with you. If you are uncomfortable/untrained/disabled/... ask someone for help. Never stand around, get a beer, without offering your help etc. as long as the work is not done or taken over by someone. No matter who you are.
To be clear: In most cases, all of this work will be done by trained people from the Revier where you hunt... just don't show you expect others do your work. This makes a big difference.
In my own Revier, I ask experienced guys long before the hunt to take over certain jobs. Since I want to sell high quality venison, gralloching is crucial - so it is done by the right guys in the larder, with clean water, light, sharp knives, winch, etc. But still: if I see someone not even offering his help, especially young men, he might not be invited again.
Once again: the above is my own expectation and of all hunters I know towards a typical German Drückjagd. It is different with "paid" hunts at big (mostly state owned) forestries. It might be different in Reviers with professional Gamekeepers, paid beaters and so one - I just don't know.