I'm a big fan of people doing what they like. I shoot an armload of different guns so it's impractical to change their barrels.
One benefit of those tubes is it puts the choke outside the original barrel.
If I was going to spend 3K on a SxS for targets, I'd have the Turks build me one exactly as I wanted.
I notice the site picture to be subtly different between 32's and 28's, but mostly the MOI. And that effects my scores a great deal, as I typically shoot swing through.

Out there doing it best I can.