They are two different things, but perhaps it would be better to explain it with doodles...
First point: I said that birds in a game that wants to simulate a zoo in 2022 are not only necessary but also not that difficult to make.
The fact that I believe that Frontier does not create a package of only birds for commercial reasons does not mean that I do not consider them necessary, it just means that following the Frontier release style a package based only on birds would be a potential risk...So, no contradiction!
Second point: even here you are easily proved wrong. Frontier's style with regard to certain elements seems to be that of "you create them", in fact following your speech we have for example mammals since the base game was released but there are still no pieces in the game ready for backstage, for habitat gates, etc... rather you have to build them yourself!
So I said that there are some pieces with which some users manage to create aviaries and it is not certain that in a possible Frontier pack they will release specific pieces to create aviaries, I hope so, but it is not said.
Who told you I didn't play JW2? In many things I ask myself "Why is there not this function, this possibility in PZ? Why deprive PZ of certain things?"...
Aniway I just need to read this "So it is true that the mechanics of free flight already exists on the Cobra Engine"...The answer is in here!