My BRV has 2500km bought 2 months ago I agree with you. In peak summer the a/c does not cool well. I also have a 2017 Civic. The Civic ac is just awesome. I have complained to the 3S dealership. They said
to bring it in so they can check the bas quantity. But they said these BRV a/cs are not too good.
My take on this issue is that this car was not developed by Honda, Japan but by Honda, Thailand and the designers there are not as experienced the folks in Japan. The engineering of the a/c is not 100% top is the game.