No. That's economics. You want to buy a bike a price point, those are the decisions that have to be made - 99.999% of the buyers would never know it. Pisti is the exception.
If you want smooth welds, then that takes a whole different skills which adds significant cost. Then people would slag them off for being expensive for what it is.
All aerodynamics body kits for cars are all fiberglass and body filler - people expect that and don't expect it to be structural. Why not use the same technology for smoothing out welds on bikes?
here's my agrument
and another
and one last one