QR joined OW well after the new DOH airport was due to be opened. Hardly seems sensible investing in massive new lounges in an airport that is due to be closed in the next few months.

As others have pointed out, the business side of the premium terminal is packed during the evening peak, literally, there are no seats. Hardly seems like a good idea to let QR Y pax in and other OW airlines F & J pax.

Regarding alcohol on request, remember this is a Muslim country where not everyone wants to be looking at free flowing booze. DOH is far from the only place where this happens though. VCE does this for example.

Best advice is to put up with it and/or wait for the new airport.