Not useless at all, if I was only doing graphics for cores that no one had ever done, then I wouldn’t have a project at all. 
I started this project to give HSM’s shader graphics that measured up to it’s excellence, and made sense with it’s feature set.
I chose vector so it can scale and be future proof.
I do overlay versions because I think the rest of the community deserves love also. (And I use them myself on my Android, Pi, and ODROID stuff.)
I will move the two Libretro cores near the top of the list, (Not to the top because I am committed to the Neo Geo set right now.) and I would love to do the others as long as I can get them to run in some version of the MAME core.
Thank you very much for your input, and for helping to make my list more inclusive.