Major Breakthrough as Quantum Computing in Silicon Hits 99% Accuracy

Is really 99% accuracy good enough. A 1gHz computer does 10^9 operations each seconds, 10^7 of which would be inaccurate. That sounds like a pretty high number to me, but I’m no quantum scientist

Are we still waiting to discover problems which are more adequate to be solved using quantum computers than classic computers?

This method does not seem extensible to more qubits...