Now I am confused as to what constitutes "consensus", is it 75% or 95%?
100% and only 100% is true consensus.
but when you talk about miners voting on one of many BIPs we can't actually expect them to reach 95% or 100%
all the BIPs have pros and cons,
there is no RIGHT or WRONG answer, its just opinions...
once the change is made and everyone updates, its fact, bitcoin is
exactly THIS, everyone agrees and we have "consensus"...
If you set the vote limit at 75%, then once you reach that limit you have 100% consensus. The 25% can fork off and die; else join the 100% consenting group.