Hey, I complained for years that the hulldown wasn't working right in PCO but no one would look at it. Finally right before the release they got to it. (Still not perfect as ground deflected hits on hulldown tanks will make it button up.)
No different than most devs. They will go for the low hanging fruit or do flashy things rather than go back and do the hard work of uncovering deep bugs. For me hull down protection and sighting is more important than decals or grass or knockdown trees.
Hulldown will be another issue with CM once the EF is released. Since gun depression is not modeled, the real issues of being hulldown, and actually using the main weapon, will crop up. It is a not a new issue either.
Hulldown, on a reverse slope, can result in having a FOV of the enemy territory, yet the main weapon does not have a field of fire. There are cases where it can not shoot down the forward slope. It may be able to hit targets at further ranges with higher elevations though. It all depends on the gun depression (and elevation).
Turret-Down on a reverse slope can result in a FOV and the enemy can not target your turret. The game does not model this I believe.
Hulldown, when a AFV is on a reverse slope, does not depend on the AFV size. This has been stated as being a condition by Steve that effects getting hulldown and they are tweaking things to fix spotting etc. It might be applicable to a AFV that are on flat terrain and trying to hide behind something, or in a ravine, but a big AFV with considerable gun depression can get hulldown easily on a reverse slope
and still use its gun!
One could make the case that a AFV with limited gun depression would also limit the gunner's spotting ability since his sight is looking at sky (or maybe a higher hill further away but his near-vision is nil).
But I think they are in a frantic band-aid mode now and focusing on immediate concerns and issues like this won't pop up till customers bother to do tests after product release. Of course, Steve will go through the whole routine of denial, berating, mocking, calling on the fanbois, calling-on-the-charley, realizing there are issues, congratulating the betas for their heroic work, and finally another band-aid will be rolled out. All with a promise of a free patch at a later date, etc.