Different Strokes for Different Folks, I suppose. Seeing the joint line in a sleeved or Mono-Blocked set of barrels never bothered me as long as it was neatly done. Would just as soon see the seam as to have the needed "Heat" applied to weld which is about the only method of having a truly invisible seam. I "personally" don't like welding heat applied to that area of a barrel.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra