Im intermediate at 3d modeling but self taught so this might sound like a silly question. I see models in the 60,000 polycount range and lower but the texture resolution on them is so sharp and clear. So is it possible to have a model that is 60,000 polys wrapped with a texture that is say 4K?
Working with a target like that keeps all of the props in a scene in the same general range of texture resolution and can help avoid things like a sharp texture next to a more blurry one which can make both objects look strange.
This doesn't work as well for things that will often be particularly close to the camera: (First person weapons, props with closeup animated interactions, or characters faces). Those usually need to hold up to a higher level of fidelity and may need larger maps to preserve details.
There are also times where a model may use a tiled texture to achieve better resolution. Large architecture pieces often use sections of tiling textures to achieve resolution not possible with a 1:1 mapping.