I could be wrong but after the backlash against Cheyenne for being so insistent on only using their carts with their machines. To the point of voiding warranties and suing other cartridge makers, having carts that are proprietary to one type of grip or machine seems like a step backwards.
I think tattooers, especially those of us who own multiple machines, want more options not less. Plus, we've all dealt with our favorite cart makers running out of stock and had to order from another company. Not an option here.
I could be wrong. Maybe Stigma's new carts and machines are head and shoulders above the rest. But unless I got rid of all my other machines and carts and exclusively used Stigma products, this really seems like a stretch.