@SaurianDruid not at all. You missed the point of dnd humans =/= normal humans. Can you cast fly? Please teach me. Can you pick a class? Let me know.
Extra appendages don't count for much more than flavor of preference.
At the end of the day it's still human based. It does not make humans boring.
It's going to go in circles. Just read my posts. At this point I'm repeating myself. No thank you.
Edit: Think about human stories. Would Joel be more interesting with a tail? Would Elle be better with horns? Would Solid Snake be better as a demon prostitute 900 year old loli? Appendages and race bluntly do not make you more interesting inherently. Writing, script, and imagination make better characters. Your preference might increase your attraction to the character, but what does that have to do with the actual character?
It isn't about making a character "better". It is about making them "different". There are stories that cannot be told if everyone in the story is human. Star Trek would be greatly reduced if you replaced the aliens with just different human civilizations with different cultures. Certainly most Star Trek aliens are basically just that, but you also have beings that can only communicate in metaphors and other species that can't communicate verbally at all. Species that don't experience the same three dimensional existence we do. Beings that, upon first glance, aren't even recognized as sapient at first.
Similarly I really can't have the same roleplay experience playing a human, even a human with magic and mutant powers, as I can playing a Lizardfolk druid who's trying to understand what makes humanity so effective at destroying his people. The idea that he exists outside the human species is core to that story.