The BR difference makes sense in air RB vs ground RB and air Sim vs ground Sim where you can pick those into the lineup. The air mission has a list per BR of what you can spawn and doesn’t seem to operate on BRs at all if you can have A10 on 7.7 BR match. I doubt that change will affect air mission.
As for writing off “effort” - even when it comes to accepting bugs as bugs, gaijin has proven that they don’t want to invest into changing the game if they don’t have to, so they want to keep the status quo as long as possible. That’s why there are many vehicles that are mostly useless because the mechanics they were supposed to introduce are dead on arrival and never fixed. They have a culture of ignoring bugs and not telling you that they don’t accept it because it won’t make money to them, so they don’t want to invest.
The whole roadmap thing after the initial economy change, which actually was something they had to do because they were forced to do by the community, is maintaining a facade of listening to the community.
Look at the roadmap and tell me that all those things are not small changes that don’t affect the gameplay much.
On the current version, there are just two changes that wouldn’t be just another changelog thing in a standard update: the exist zone for air AB and replenishment zones. All other stuff is just minor balance/economy/ui changes. It shows the amount of time they can spend on the implementation if that’s a half of the year plan here…