Your criticism of IRV is on point. A revolutionary might be happy to see the center squeezed so some kind of radical or reactionary ekes out a win, just to shake things up somehow, but I would not be.
Approval voting's main real advantage is in implementation: like FPTP, it is a one-pass system requiring only a running tally of votes, one data point per candidate. But despite the rumors based on inapt metrics, it is highly tactical. It is "inherently tactical"-- even an honest voter must make a tactical choice in a three candidate race. You a... (read more)