Tend to agree. The thing is, you don't really have to go that much past 12" to turn "big". It's all visual. I would call a 12" bowl of typical depth a "medium" bowl and I think most people would probably agree. But you don't need to turn a 24" bowl to go twice as big. You only need to turn a 17" bowl (12" = 36pi, 17 = 72pi-ish). And I think most people when presented with a 17" bowl would call it pretty darn big. A 20" lathe with the appropriate hp motor is plenty of lathe to turn "big".