I know some. There are arguments over just how good Google’s results really are.
The BIG problem is scaling them up. The number of qubits (quantum bits) in a computer is still too low for big problems. The 53 in the Google experiment is high.
But it is good that there are problems. We aren’t ready for the security implications. A lot of widely-used cryptography is vulnerable to these machines - when they get big enough. Work is going on to replace them but it’s taking time - not least because the replacements need to be shown to be secure against normal attacks.