I don't know enough about quantum computing to know if it is an actual threat to the future of bitcoin. I have heard arguments on both sides, but mostly from people that I feel do not have a very good understanding of bitcoin.
Any thoughts?
To give you a hint, we have a lot of threads about it,
So just probably go to that thread and read everything about it. And the reason behind not using a Bitcoin addresses is that your public key will not be exposed.
Or if the threat is real then Bitcoin developers might replaced the existing SHA-256 with a more quantum resistant has function.
This is also my opinion, if quantum computers become a threat, bitcoin developers will not stand still, they will respond with a more resilient system. I hear that current quantum computers are far from breaking ECDSA or SHA-256 because of their high error rates and limited number of qubits, and moreover, they say that it will take 10-20 years to develop the quantum computers needed to break the Bitcoin network.