In the day - holsters were not thick sole leather nor were they expected to be open at all times for "combat reholstering." It's something that competition has forced into the discussion, along with handcuffing suspects.
Doesn't mean the holster selected can't be suede, as a lot of IWB carriers deliberately choose it. Both of mine are. I don't expect to ever reholster into it while connected to me - detaching it and reholstering in full view of my vision is how I perform that.
A SA gun does get a lot of reholstering due to the traditional means of carry but that doesn't make it a death sentence. The cut and style has a lot to do with it, and also the concept that it be carried hammer down on an empty cylinder if it's a SA Army type gun. Most traditional holsters aren't stiff sole leather outfits, and restiffening is something that can happen with any American maker, too. Hunter brand comes to mind, along with others. Let's not broad brush it too much.