@mcc it's hard to know how this would work in practice, but tactical voting under approval voting seems way too obvious. And if there's widespread tactical voting then the benefit over FPTP is limited. Condorcet is somewhat more complicated than IRV but when the condorcet winner isn't the IRV winner, I think condorcet better matches people's intuitions of who should win. IRV is advertised as selecting moderates but it doesn't actually do that. This matters in practice (see Burlington 2009.)