[rndphs]

Well yeah, there is still unresolved issue(s) with at the very least the interpretation of quantum theory, if not the math. Before decoherence things were even worse, and that was much less than a century ago. The fact that physicists still haven't reached a consensus on what the theory means is very intriguing to many people. Although it's true that people probably underestimate just how much this territory has been trodden. The current quantum computing hype likely plays a role in it seeming "cutting edge". It may just be flavour of the month.