I guess that anywhere that you get your inspiration is fine. The bottom line is that our talents are never hardware based (unless we are collectors and not players). It is impossible to discuss or quantify the percentage of horn in what we do.
I will say that if a trumpet player can't get a standard Bb playing job done on a brand new Bach, Schilke or Yamaha, then they simply suck.
Once our playing is at a level that color becomes the significant difference, we all realize that it is no longer about "us" rather about "ours". Making music is mostly a collective activity and I have had enough disappointments with members of the ensembles phantasizing about the "magic" of their instruments.
There are so many fine horns available from all periods, I see no reason to limit myself. My newest horn was made in 2007, the oldest before 1900. Each has a defined position on the palette of colors that I offer. Almost all of them get played, the expectations of the contractor and other musicians are definitive.