I think you’re right, that sounds like the way to go. Maybe Teapot (standard), Tea Spoon, Tea Cup, and Teapot (original) for the Object Type names.
But for the teapot version that’s been in this add-on all along, I’m leery of making changes. Back when add_mesh_teapot.py was added to Extra Objects on May 3rd 2012 the intent seems to be to give Blender’s users access to a standard 3D test object, one that came with other 3D software. If we change something that makes the primary output of this add-on no longer that standard, I think our proposed changes are doomed to fail from that alone.
“& easter egg (Spoon)” is how the teaspoon’s referred to there. We don’t know why D’Agostino chose to include that but not the teacup. The 7.64 KB size of the teacup’s data was a far greater consideration in 2012 than it is now, maybe he could only fit one of them, and picked the spoon. Or it could’ve been the issues Boder’s mentioned above. Or both. But I think that ten years later including the rotation-fixed 1991 teacup data is a reasonable ask.
You posted above “ . . . just because the majority is used to something that alone doesn’t make it correct . . . ”, which I don’t think is a good reason to alter a standard 3D test object in use for decades, but arguable warrants adding a more authentic version (if you can come up with one you’re satisfied with). And if somebody provides the little milk pitcher’s data I’d love to see that included. But then I think we’re back to my original question: Where/how do I propose getting these changes made?
I asked here first in large part to avoid annoying and wasting dev time by fumbling around and scattering queries hoping one hits the right spot – there’s gotta be a way this is supposed to be done, I’d like to get it right the first time. But following thru the links zeauro provided above doesn’t help much that I could see. Blender.chat isn’t an option for me (I’m on the autism spectrum and have difficulty with chats). And while zeauro’s idea to poke @cwolf3d produced three likes from him a couple days ago on my then-three posts in this topic, I can’t tell if it’s done anything else.