To pull things back on topic, I do have some comments/questions.
Given the H-20's likely range, it seems it will enhance China's regional power projection but not add to global power projection. At most, it may or may not help put northern Australia and Hawaii within reach. My reasoning for this is that China lacks the global base network from which to deploy air refueling tankers. Even if they did, those bases would be vulnerable, perhaps even indefensible, during any real war with the US and its vassals.
Given all that, it seems very clear to me that large numbers of B-21s are much more essential to US hegemony than H-20s are to China's defensive posture. It'll help increase the likelihood China can destroy regional logistics hubs that US hegemony will rely on against China, so obviously still important in that sense. Perhaps that could be one of the reasons that they are taking their time with the H-20? It seems like it is being treated as a 2nd tier priority as far as effort and resources channeled to it, which I agree with.
I don't see a comparison with B-21 as useful. H-20 and B-21 should both be viewed in their own terms, and imo there are absolutely ways in which H-20 could be vital to the PLA's ability to strike at locations outside of the 2IC (as you said, Hawaii or Australia), or to more heavily strike or re-attack targets within the 2IC and in -- and these capabilities are far from trivial, if anything they may also be decisive.
There are many reasons why H-20 could be emerging a bit "later" than we had initially expected. Any of them could all be equally valid as the other.