For anyone wondering why accurate emulation is important, the nightmare scenario is something like N64. Those early emulators like UltraHLE were stunning, no argument. The fact they worked at all on 1999 hardware, let alone at playable speed and with enhanced graphics was nothing short of mind-blowing. Being able to run Mario 64 and Ocarina of Time even on my shitbox first PC blew me away. The trouble is the emulators we're using now are patch jobs that are still heavily based on those same early emulators. Accuracy needed to be a distant second priority to speed back then and they were built off hacks and tweaks even to begin with. This means overall compatibility is only marginally better than it was a decade ago and we're now at the point where fixing a bug in one game breaks ten more.
On the other side the coin you have a SNES emulator like Higan that needs a beefy computer and perhaps isn't the easiest piece of software to use, but was designed for accuracy first and foremost and actually managed to reach 100% compatibility within something like six or seven years. Pretty sure I remember reading the SNES9X team have incorporated parts of the code into their emulator too, or at the very least used it as a jumping off point. So yeah accuracy is important because it improve other emulators as a result. Now compare that to something like Zsnes or Nesticle, which were amazing pieces of software back in the day, but were again designed with speed as their focus and in many ways were held together with chewing gum and pieces of string. A lot of older ROM hacks for example were designed to run in Zsnes because that was the only option at the time. Now that flash carts are a thing, surprise surprise, it turns out many of them can't be made to run on real hardware at all because Zsnes is so different.