A lot of people seem to be hung up on the missing space battles in Star Wars: Battlefront. It was a key feature in Star Wars: Battlefront 2, so it isn't hard to understand why people think taking them out might be regressive. Especially when you consider a lot of people were hoping for land-to-space battles to begin with.
Speaking to OPM (via Gamespur), DICE General Manager Patrick Bach took the question on why the game wouldn't feature land-to-space battles:
We want players to stay in the same [environment] – we don't want players to fly off and do something over *here.* It's about the Battlefront experience, so we want to keep you in-atmosphere and fighting with the infantry.
To me, that makes sense. Unless we are talking about hundreds of players in any one game, then there is no reliable way to police where people are. No matter what, the battlefield is going to feel empty somewhere if you have to option to fly into space.
Still, like I said, I understand why people are upset this isn't a feature. I think you have to be realistic with how multiplayer matches work too though.