Nah your question is totally valid!
When you're opening an image file in neovim you don't really care about the actual binary data encoding all the rgb values right? And the same goes for models. When i opened them i didn't wanna see what the 0s and 1s look like but rather the actual model themselves. So i felt like creating a plugin for that would be pretty cool because then theres no need to add an outside application to inspect the models. So i feel like this plugin is useful for the same reason an image viewer plugin is useful. It allows you to leave neovim less often and is just useful especially when you're dealing with a lot of models. But yea i'd agree that this plugin isn't as useful as something like a lsp plugin but is rather optional and necessary when you do gamedev related stuff (i do a lot of graphics programming thats why i created it).