Of course you're right, the beacon is
not mandatory since H mode is akin to an APU. In my operation, most ground crew won't do any work anyway if H mode is on due to high noise levels -mind you, some of them don't even wear ear defenders! We hardly ever use H mode on turnaround anyway, we get provided with GPUs at all stations. And we don't get to park into wind, we have to stick to the yellow line!
Power back is very convenient and again saves a lot of hassle with tugs etc. but some operators don't use it - and some airports won't allow it; you know, the kind that overcharge on handling etc.
The cargo door open max wind component is 45kt, so it's usually not an issue.
Cheers
