Did I miss a press release or something? When did FDEV announce a release date for the first paid expansion? Oh, right, they didn't. So what's the OP's agenda here? Criticise FDEV for the state of the game if you like, even if it's tediously unoriginal criticism. A lot of us have done that. Having a go at the hardworking devs about something that you dreamed up, however - that's a bit much.
Planetary landings are a feature that will require a lot more effort than the entire game has to date, if they are to be delivered with anything like the graphical fidelity and solidity of even the existing content. I'm not sure it can be done, frankly, but I gambled my money to help fund future expansions. As a reward for some faith in their ability to deliver, I don't have to pay more for the expansions when they are released. Yay!
You seem to be expecting a feature, listed as a paid expansion before day one of development, to now be given away for free because you either didn't pay attention at the time or didn't want to pony up the dough. Yeah...no. Never gonna happen. Get over it.