Being fairly new to semi-auto pistols, I have a simple question. Why aren't all red dots (for pistols) the same size and base? I realize they are all made by different companies, but standardization is common on pic rails, Weaver mounts, most other optic mounts. Now the part that mounts on the gun is different on something like scope ring bases, and that's understandable. But if they were all the same hole pattern, no base plates would be needed, or backlogged on orders, plus the red dot would mount lower, and only use two screws instead of four. Am I missing something?