For me (garden designer, using Landscape VW instance)
- Clipped cube/Section models as per thecadman's post above. This is something I'm actively struggling with at the moment as I need to provide some side-on elevations, but can't render them in Enscape. For me personally this is no. 1 missing functionality to be addressed.
- More plant assets. There are currently a lot of large trees in the asset library, and also house plants, but as a domestic garden designer there is little for me to use. I end up having to bring things in from 3D warehouse into VW (sadly VW's own plants are also quite limited, but also not true 3D models); some of these 3D warehouse models are very high polygon and so it really slows rendering down vs using Enscape's own ones, thus it would be better if there was more choice within the Enscape library. (also I like how Enscape plants move in the wind, but obviously imported ones don't, so again more reason to want more Enscape ones in the library)
- Weather effects and seasons, as per some of your competitors would also be good.
Overall I really like Enscape and being able to real-time update in VW which much better than some of the competition, but there are a few more things which would just make it that much better overall.