Many decades of experience in what? Staring at trees? I can say with confidence that I have seen trees sway just like they do in the game. That you haven't does not make my perceptions "incorrect". And I expect that the game developers have seen the same kind of weather phenomena as I have, since they don't just pull the game visuals out of the hat if they can get real life reference material, instead. The only unrealistic bit is that the trees only seem to start to bend around one third up the trunk with a small but visible angle, but that's plain old engine limitation, and barely noticeable in normal gameplay.Incorrect, but you're entitled to your opinion based on the perception of your experiences.
My own comes from many decades of experience.