It's been a while seeing a good and fun pass! Shredded for a few runs and here's my opinon:
1. Better textures always better, however despite the lower res textures (because from photogrammetry as you said) that actually bends well with overall environment. It's low res but it actually looks not that bad. It would be better if you can have a better one indeed but it's not the biggest concern to me yet.
2. The more bigger concern for me is all the floating trees, holes and distorted meshes. Before I read it I can already tell that is a scan by those distorted meshes. So those are more ugly looking then textures, and those are more in higher priority to fix if you ask me.
I'm loving this route and can't wait to see a better version. Please keep on updating it.