First off, thx for your comprehensive considerations. As for versatility i don't see that too much with BTC, which would ideally be a means of trustless transactions, so whereas this in itself is great, i don't see that much of potential to do things other than just that, so if you dont mind, btc is rather like a barbie, shiny but one-dimensional. The lego idea in my view, originated from the promise of ETH, that you will be able to deploy any application on that chain, but in its current implementation, just can't deliver.
Assuming that you qualify EOS as least trustworthy chain, is based on the fact that it uses the DPOS concept, how does that now also apply for Steem? Despite some issues, this doesn't seem to be that big an issue for Steem. Where is the difference then? And why is it less trustworthy than the mining conglomerates we know from BTC and ETH? To me the lesson of the recent BCHABCSV fork, is that proof of work is well attackable, and the hashpower in the hands of a few can pretty heavily disrupt and harm a chain, and a holder or user can just do nothing about it....