Everything about bitcoin, including its mining, is still decentralized enough to not raise any serious concerns. However, we have what I call traces of centralization that tend to creep in no matter what we do, and that's something we need to remain vigilant about to keep them minimal.

When it comes to mining, as long as the hashrate is distributed in multiple independent jurisdictions, things could be considered fine since no one entity would be able to gain control or exert power over large number of the miners.