Your link just describes a few other industrial uses for helium 3 besides dilution fridges, mostly having to do with neutron absorption and nuclear polarizabili

Your link just describes a few other industrial uses for helium 3 besides dilution fridges, mostly having to do with neutron absorption and nuclear polarizability (which aren't exactly household needs). This is a good contribution to this conversation, but it doesn't shows at all that helium 3 is "what is used for most applications". For the vast majority of industrial and scientific usage of helium, helium 3 does not offer much advantage.