And just because it's exotic, that doesn't mean it's not useful to think about. My impression from some rather limited exposure to quantum chemistry is that the

And just because it's exotic, that doesn't mean it's not useful to think about. My impression from some rather limited exposure to quantum chemistry is that the molecule hits a sweet spot where it's both not completely trivial to solve, yet within the capabilities of present-day quantum computers, meaning that it becomes a useful benchmark for algorithm development. See e.g. https://arxiv.org/abs/2303.07417 https://arxiv.org/abs/2303.07417 (which covers H₄ and LiH) and the references therein.