Regarding the campaign(and what I have seen from the MP), I am disappointed that the environment is static. Nothing moves other than the player and NPC(enemy). I would have thought that they might have learnt something from other games regarding a live environment. Looks like a early Old-gen(Xbox Series One) game to me ala Destiny/Destiny2 from the gameplay environment wise of what I have seen.
I gave this some brief thought, and my conclusion is that if there is too much (possibly any) movement in the environment it would be completely out of place on a Halo ring.
Weather systems and thus wind that moves vegetation make sense on Planets and possibly even Dyson spheres where you can have complex weather patterns.
On planets (in very simplistic terms), that is primarily based on how much sunlight a given region receives combined with the rotation of the planet and any particular hot spots within the earth's mantle (magma chambers close to the surface, for example) or elevation relative to sea level.
However, unlike a planet every single part of a Halo ring receives the exact same amount of sunlight. Any tilt that affects the sunlight recived by one part of the Halo ring will be experienced by every part of the Halo ring as it's day cycle rotates the ring to that location. There are no magma chambers and elevation is relatively limited. Unlike a Planet, every single part of the Halo ring rotates at the same speed although there are minor differences due to "elevation".
Basically think of a Halo ring like a gigantic green house. Every aspect of the atmosphere and any differences in environmental temperature (due to different Biomes) are artificial and controlled to exact specifications. It has to be controlled as you also have to prevent any of the atmosphere from escaping into outer space because unlike say a Planet, there isn't a massive source of resources which can create and release gasses into the atmosphere as it is lost to space.
A Dyson sphere is similar to a Halo ring in that every aspect of it's atmosphere and any potential weather effects are going to be artificial in nature. A Dyson sphere basically revolves around an internal sun, so in essense every part of the sphere receives the same amount of sunlight. However, there will be rotational differences between different latitudes of the inner sphere which will inevitably lead to some weather patterns forming. And, unlike a Halo Ring a Dyson sphere is completely enclosed and thus there is no risk of loss of atmosphere if the weather isn't controlled to an exact degree.
Of course, this is all Science stuff and Halo is a game, so it doesn't have to adhere to any of this. But that thinking part of my mind would be hugely disturbed if there were any strong winds on a Halo ring. Hell, even a gentle breeze would make my brain twitch uncomfortably. As a game, there could be hurricanes on a Halo ring and it'd just be explained away as game magic. But it would bother me to no end to see something like that on a Halo ring.
So, unlike most games which have no wind effects on in game vegetation, that doesn't bother me in a Halo game set on a Halo ring. That pop-in though, they really need to do something about that, IMO.
Regards,
SB