Yes but a fair chunk only produce meshes as an afterthought. They often use a neural representation (or gsplats or density fields) and bolt on mesh generation for portability.
(This particular project does seem to be specifically about meshes but I'm addressing your broader point)
Not every application of 3d generation necessarily needs meshes. Or rather - might not need meshes in the not so distant future.
We'll see, but we've heard this story before with other proposed alternatives to mesh-based pipelines. Voxels and point clouds were all the rage in research for a while and poised to take over as soon as the last few pieces came together, but they never did and we still use meshes for nearly everything, either by creating meshes directly or turning some other type of data into a mesh. We still need to figure out how you're even supposed to edit static neural assets at a fine-grained level, nevermind animate them with precision, nevermind do all that efficiently.
(This particular project does seem to be specifically about meshes but I'm addressing your broader point)
Not every application of 3d generation necessarily needs meshes. Or rather - might not need meshes in the not so distant future.