Revit 2023 now supports hiding triangulation edges for imports, including the types of imports that Enscape assets use for their placeholders. The good news: this means we can finally have good looking Enscape assets in plan, elevations and sections!
Unfortunately this doesn't apply automatically. For this to work, Enscape assets need to consist of a single mesh with all triangles attached (they share the points). This doesn't seem to be the case for now, which is why the internal edges of the mesh still show up.
Could the Enscape development team take a look at this. This is potentially a small fix that would have a huge impact for us working in Revit.
I have included an example of an import in Revit 2022 and one of the same import in Revit 2023. Note that this works only for newly imported files, existing imports will remain tessellated, even if you upgrade your file to Revit 2023.