Vet sim pilot here as well, when I got this simulation I was 100% satisfied. Maybe there is a new generation of sim expectations floating around on this board (complaints of only 25FPS), but I never expected the trees to be collidable. I tend to hide behind hills and buildings for my missions and never once though of ducking it behind a few Pines. Reality or not.
But for a few bucks, there are a handfull of those who want the entire world simulated, regardless of CPU resources, memory limitations and last but not least, software development time and costs. They want the FPS friendly simulation with thousands of solid trees, Line of Sight computation and Coolidability without any performance hit.
Seen this for decades. You want collidable trees, but then people will complain about 10 FPS and wandering why they can't place units in forrests. Or not being able to designate targets between two trees because there's an invisible collider box blocking the laser. Or complaining why player helicopters collide with trees but AI doesn't and asking for collision detection for every object in the game to level the playing field. Or the guy colliding through trees he didn't see, because his graphic settings are tuned down.
I've seen complaints of people not being able to land on water and trains.
I've had the "simulation sickness' before, where you don't want ANYTHING to spoil your feeling of "really being there". But truth be told, you're not there, it's a simulation made for entertainment and curiosity. That's why this industry is so small, to simulate something, you have to simulate it ALL and sacrifice NOTHING. It's an addicitive sickness, and I've found that in order to truly enjoy a piece of affordable, repeat..affordable, software, you have to be willing to let go of the desire to check for every rivet to be in the "right" place, EVERYTHING to work just like in real life. Come on..relax a bit and have some fun for once. God bless the developers for making this available to civilians like us and responding so professionally.
P.S. in regards to the "new Engine", I wouldn't wait for anything else anymore, I would enjoy what you have..which is an exceptional peice of software.