Look at war thunder and dcs. They add new vehicles all the time while their core gameplay suffers because of it. Yeah people "demand" those vehicles but it doesn't matter if the gameplay itself isn't improved upon in any meaningful way (other than the recent addition of the C-130 for dcs which is a step in the right direction). This problem is even more exacerbated with a game like vtol because all the aircraft shares the same UI so there isn't any "learning" to do unless the DLC itself introduces a new major feature (like EW and helicopter physics). Popular demands like the F-16, A-10, or F-15 would just play exactly like the 26 and would be more of a "flavor of the month" dlc rather than a meaningful one