ESO has very nice zones, but it’s no secret that all of the DLC zones are much more detailed than the base game zones. For example, compare a zone like Wrothgar to Glenumbra lol. The design and verticality of newer zones are significantly better.

The Devs have undoubtedly (and naturally) become far better at creating things over the long history of the game since launch.

I’d actually love for one chapter to feature a redesign/improvement upon all base-game zones, instead of giving us a big new zone (maybe a smal zone would suffice assuming the redesign happened). That’s just me though

Im having a hard time trying to understand how people can be bothered by such trivial things while the games most basic functions are that broken.

The only real forest in Eso is Selene's web, and that other "something-mont" place in Summerset. The rest is just sparse grooves.

Valenwood
In my opinion Valenwood is one of the regions with the most need of a review. (EDIT: Along with other places such as most DC zones) The overall problem with the Valenwood zones is that none of them are particularly distinct from one another (save for maybe Reaper's March) and can feel generic. Most of Valenwood feels like a large open space with trees & flora that are few and far between. Which doesn't feel right for a place like Greenshade which is supposed to be "A Jungle at it's most Primeval". The simple thing to do would be to edit the vegetation and make the zones feel more alive.

Shots of Valenwood zones
However if ZOS wanted to completely re-design the zone...
Do you want to know why Selene's Web is one of my favorite dungeons? It is one of my favorites because it actually feels like I am in Valenwood - sure it has an atmosphere of Selene's influence but it still feels like I am in an actual Valenwood forest.
Imagine if Grahtwood or Greenshade took after its design as a multi layered zone - with an atmosphere of a Forest that is Vast & Ancient.
At first the forest maybe doesn't seem large but as you venture you find that you can literally drop down to the very bottom roots of the forest as well as spiraling branches that takes players to the upper regions of the trees
With Networks of tunnels in the open world, vertical landscape exploration design where players could go literally deeper into the forest - all with no loading screens - that could make the zone a fun place to explore with the new "Antiquities" system of Greymoor
If ZOS wanted to they could redesign the the surface of the Valenwood zones and make the levels below as DLC zones that players can travel deeper into. Providing depth to an already existing place as well as giving more attention to the Wood Elves

Shots of Selene's Web
The Concept art for Valenwood was the most ambitious and the least utilized. Imagine these pictures as the levels that players descend in the forest. From the bright leaves and blooming flowers to the dark gnarled roots covered in muck with all manner of creature hiding down there.
https://www.youtube.com/watch?v=mGC7RRt_OIE

@Danikat
Exactly!

Valenwood feels like a forest that is light on vegetation when it should almost like a Jungle maze with vertical design.
With no sign fo the ground and the sun becoming increasingly less visible.

Then there's the textures - oof. There's just so much work that ZOS needs to do for that zone.
Sure Breton zone is vanilla but they kind of are and although it could use touch up their zone fits them.

Valenwood might not ever get a focused DLC and we are stuck with wasted potential.

My immersion says yes, but my performance says noooooo

There is a lot that can be done to improve the atmosphere: more trees in Valenwood, more snow/ash/sandstorms in the relevant regions, more mists in High Rock and Black Marsh, more lag in Cyrodiil.