Now Im going to use an example so say, a create a wall a blender now if I use it in ue4 the textures will be all screwed up, now for the jist of it, does doing retopo fix your model for holding a textures or rather “would it help with doing that”.
You need to do UV mapping to fix skewed textures. However a well constructed mesh will be a lot easier to UV map so some clean up and re-topology may also be needed.