Not only are most third-party crimp tools kind of marginal, but if you're buying connector kits of Amazon/ebay/Aliexpress etc you're getting knockoffs too, so y

Not only are most third-party crimp tools kind of marginal, but if you're buying connector kits of Amazon/ebay/Aliexpress etc you're getting knockoffs too, so you have a lot of degrees of quality freedom between your crimp pin and your tooling. And you're probably getting your connector and its mate from different manufacturers, too, which can have its own set of issues.