As someone who has written multiple OBJ readers over the years, this is interesting, but noteably seems to be ignoring texture coords (UV coords), and doesn't support object groups.

Also obj material support is an absolute nightmare if you ever try and support that: there's technically a sort of original standard (made around 30 years ago, so understandably somewhat messy given how far materials and physically-based shading has come in the mean time), but different DCCs do vastly different things, especially for things like texture paths and things like specular/roughness...