I find if you look you can find an answer. For example PMDG have announced on their forums that the 737 will come to Xbox. Prior to the WASM implementation on the console there was a lot of questions around how and whether it will be done and the devs were relying on Asobo/Microsoft before they could confirm anything. Now that problem has been solved they can confirm that if the testing is successful you can expect to see it after submission to the marketplace, which again relies on Asobo/Microsoft to approve. It’s quite a convoluted process but it is what it is. Maybe this why and I can only think the devs can answer for themselves.
If I’m interested in a product I generally look on the devs forums and usually find the answer I’m looking for. As you point out that isn’t always the case and it can be a pain looking at times. But if I’m interested I don’t mind spending 10 minutes scrolling the forums or send them an email with my questions. Not all developers are made equally, some are really good and committed to delivering a quality product. Others not so much.