And, key for most of us, how to get the most for the least...(constrained budget).
My guess is that if Tekton markets a 4 ohm speaker it's because they think it sounds best that way... They are not going to add a cheap resistor that bumps it to 8 ohms but screws up the intended voicing.... meaning if you want an 8 ohm version (which other companies wouldn't offer) Tekton is going to make sure it sounds right.... so I'm ok with having options and paying for them as long as I know what I'm getting.