There is consensus on the blockchain as demonstrated when a hard fork is enabled or (as has occasionally happened in the past), not enabled, the latter indicating lack of consensus.
Other than hard forks we haven't up until this point had an objective way to measure consensus, but the SPS will do so, since it will be voted in a verifiable public way by Steem stakeholders. Previous efforts at "polls" and such things have never been objective or particularly meaningful.
I don't actually know what point you are trying to make by bringing up Steemit vs busy or esteem, but there is only one Steem blockchain, and when you are looking at things like the reward pool being paid out, it is only the blockchain that matters, not the UI. When looking at things like what is hidden or grayed out, that is UI. The issues affecting one or the other are very different.