IMO, way too much is made of the "ruggedness" of fixed sights over the supposed fragility of adjustables. In thirty years of le, which involved more than a couple of "tussles" with bgs, I only had one experience where an adjustable sight was damaged. That incident involved a felon whose parole was being violated and he didn't want to return to prison. We got into a roll-around during which time a part of the blade of a Smith adjustable sight was broken off. Would that have made any difference had I had to use the revolver at point blank range? Nope, it wouldn't have. My point is that if an adjustable sight is ever going to fail (get broken) it will only happen at close range and at those kind of close ranges you really aren't going to need sights of any kind. I'm talking about real world scenarios here.
On the other hand, if a handgun is going to be carried in a mode other than a holster, snagless fixed sights certainly have their place when a draw must be accomplished without a sight catching on clothing. But from leather? Give me the flexibility of adjustables any day of the year.