Hi Nic, no rules against self-posting as long as it's interesting articles like yours and not just self promotion.
I know a bit about quantum computing too so I did a high-level fact checking of your post without finding any bugs. Impressed you managed to do math equations on medium. It is a bit long though... saved to continue later.
On a different note and for a different perspective, you should check out this excellent review paper by Sara Robinson, Emerging Insights on Limitations of Quantum Computing Shape Quest for Fast Algorithms: https://www.siam.org/pdf/news/100.pdf It's an old article, but all the points she raises are still valid. I think it's going to be REALLY hard to get large number of coherent qubits to do computations.