Both very fair arguments, I actually just bought a Lefty Umnumzaan because I liked the idea of a knife tailored especially to me. But also as a collector I wanna find a work around that I can use so that I can carry anything I want.
Completely understandable.
I own knives that have right-handed locks but they also have left-handed carry clip options. I do have 2 that are right-clip only but they were really cheap and bought when I first got into this hobby. There are knives out there I would really love to own such as the DDR GunHammer you mentioned but due to the right hand only carry option and the high price tag, I just avoid it (albeit a little reluctantly).
My mindset does limit the knives I can collect but to tell you the truth, I probably need that so I don't go buying everything in site.