I wish they didn't go with integrated PSUs. I don't trust anything other than server PSUs to deliver that amount of power without being electrical and fire hazards.
I dont know about the new Avalons but many of the new units including Bitmains use 20v internal rails, 12v PSUs just wouldnt power the miner properly. Its not that they are trying to force us into their PSUs, they are just a requirement for the unit to function.