Well Mr. Paul,
I can understand that you're happy with comparing "non-correct" open top revolvers to a design that is used even today!! All makers of S.A. revolvers today use a frame that has a screw in barrel (it's all about economics), that's easy. To make a true copy of an open top (you know, the first "successful" multiple shot pistol) it should be a true copy!! None, until lately (Pietta has addressed the proper set-up but still has its own issues) are representative of Colts design down to the tee!!
That being the case, the open top with it's wedge (forget the screw, that is just to keep the wedge from being fully extracted. Helps to know what you're arguing against!!) is actually a stronger structure than your anemic, thin top strap, skinny frame (plunger cross section) revolver. I am even a fan of the Remington's myself (wouldn't have spent almost 2 years figuring out how to spring them with coils!!), but the fact is, the large arbor, robust frame and barrel lug is a much stronger design than the comparable, period, top strap S.A.! It's just much more labor intensive to do so (it's at least a 20 yr. older design!! But an excellent one!!!) In fact, I actually bent the frame of my Remington trying to load some "too big balls"!! Lol!!! You wont/can't do that with an open top Colt type S.A.!! In fact (again!) I've actually sheared a loading leaver pivot screw on a Walker (ASM) doing the same thing. So, I replaced the screw in the Walker, I didn't replace the Remie!!
So, as to my statement, a correctly appointed open top revolver of Colts design would and should be an equal if not better than the top strap Remington. . I can assure you that my own cartridge converted Dragoons (of Uberti build but highly " massaged "!) are extremely accurate and quite frankly the most accurate revolvers I've ever owned!! That has been verified by an ex 3 gun shooter/customer of mine which I've had the pleasure to shoot with!
So, the "good reason" the more economical Remies/Rugers are what you see more of is, quite simply, there's no "correctly" produced open tops to compare them/compete with!
Pretty simple once you understand the "why".
Mike