Well the fact is, between Amos and myself we've gotten smoothbore airsoft guns both bolt and electric to shoot DAMN far and DAMN accurately.
Further and more accurately than you could with a TK twist barrel actually, specifically because your limited to a low joule rating, and thus, light ammo, meaning it's very likely to get swept away by the wind.
It's a widely accepted fact that smoothbore barrels and get you consistent accuracy out at 150ft no problem.
Sure you might be able to reproduce those results with a twist barrel....in a hermetically sealed environment....
But anyway, there's no use in going to twist barrels unless they start making them for 1.7 and 2.0 joules