But we do have a ton of "analog quantum computers": basically any experiment in quantum materials or quantum chemistry is something we can not simulate and some

But we do have a ton of "analog quantum computers": basically any experiment in quantum materials or quantum chemistry is something we can not simulate and something that informs us about analogs of such systems. No different from using single-purpose analog electronics experiments to predict as an analog to trajectories of spacecrafts or ocean currents or bombs or planes. In both the classical and the quantum case, building a digital computer (a computer that has the potential to scale to large system sizes, unlike analog computers) is what is difficult. Babbage and Lovelace imagined a digital computer in 1830s. It took 120 years until there was an actual digital computer in existence. It took the creation of an actual digital computer around 1950 for people to stop saying "digital computers are impossible because of noise". See "Probabilistic Logics and the Synthesis of Reliable Organisms From Unreliable Component" by von Neumann, to see how incredibly surprised theorists were at the time. Quantum digital computers were conceptualized in the late 1980s, the existence of quantum error correction (the equivalent to von Neumann's paper) was shown in late 1990s. Compared to how long it took for conception-to-realization in the case of classical computers (120 years), the quantum side of things is not that terrible (30 years and counting).