Here is what drives me nuts. I have owned two dot-equipped pistols that have a common footprint, namely the Optima 2000 aka J-Point aka Shield RMS(c). Trijicon even private-labeled the sight as I had one on a S&W M&P .45c. For all of the other issues with the Shield sights, the common footprint is definitely a good design choice. So for basically a decade, one can find a sight for a pistol and not worry about plates or needing a new slide. Iron sights are bad enough in terms of footprints, but the cost is minimal as sights can last a decade with no issues. Dot sights fail a lot more often, and I am not willing to obsolete perfectly fine weapons because a sight footprint is made obsolete. And Trijicon just added a new footprint.