I have posted this similar suggestion on steam. I put it here as it contains some extra suggestions (higjlighted with bold typeface):

Observation:
Characters can effortlessly glide through (brushes or trees) and water.

Expected:
Characters moving through thick vegetation and water should struggle and slow down.
This would be not just more immersive and authentic, but would add more tactical depth moving through terrian.

Implemetation:
I think everything is allready in the game to implement the feature.

• The enginge can clearly detect characters moving through brushies or trees and water as it plays the approriate sound effects.
• The animation used for moving up steep slopes would be perfect.

Extra suggestion:
Adding movement to bushes a character is moving throug would be a welcome addition as it would give away the movement, and would make steathy appraches more difficult.
As the wind can already move the vegetation, maybe it would be not too hard to implement.

@tuskohopkinsz Good suggestions, yours should be looked at aswell, thank you for your insight.

I like the ideas of having bushes shuffle around as players move around inside. I feel like bush movement (ideally), progressive sounds, and posture are enough to balance them. Slower movement speed is reasonable but at a standing posture. Crouched movement should impact the bush less and prone has the least impact on both movement and sound.

Bushes do make enough sound to identify where a player is if you are close currently (depending on audio devices) and speed does effect that too so i don't think things need to change drastically, but bush movement would be a great idea and having posture impact your speed is great as well.

I would say yes but at one condition, locking some distance shadow/grass/etc.. for everyone. Currently people use pushes because we can't hide in the grass at long range, and we can't hide bellow tree neither.