When people started singlespeed mountain biking back in the Tour de France or the 1870s or whatever, there weren't really any singlespeed frames. People took old ones with vertical drop outs or horizontal drop outs and used tensioners or didn't. Therefore, the bikes were pretty cheap. I've only read about this, because I think it took a long time to get to Connecticut and I wasn't born yet or something. Now, as you know, they make whole bikes of this sort of and they're fancy and not fancy, but with the exception of Redline Monocogs, I only ever see the fancy ones.
Anyway, which way is it meant to be? The lowest functional thing that can get you through the woods or the artisanal jewel? Can they co-exist?