Fine. MSFG has done that.
To be honest, it's rare that I need to select scenery by developer. I like Orbx, they were the first add ons I bought, but to get global coverage it's best for developers to work on different projects. We've seen this in Sydney where Orbx didn't do YSSY, leaving it to flyTampa, but they're working on the Cityscape. Reverse, they did a CityScape for Honolulu but didn't do PHNL, that's done by FSDT.
There are decent sceneries for every major Australian airport, but not all are offered by Orbx. It doesn't make business sense for them to compete with other developers - and we lose out if they do.