Genuinely Curious, Why Does Dr. Mundo Exist?

What role/game play style does he offer that others don't? Why have a champion that's healing forces every one to buy grevious wounds, which then forces them to be balanced around grevious wounds always being applied to them? What makes Dr. Mundo unique and makes players want to play him? Why does Dr. Mundo's kit have no synergy? I don't think Mundo is OP or anything, but I do think he is a disaster of a champion, extremely flawed in design, and honestly kinda pointless like why should he still be in the game? Would love to be proven wrong, so please let me know what you think.
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