Yeah, I think the fact that the X card has issues doesn't mean all safety tools are bad. I think regular check-ins are an important thing and something I've been trying to build into my games lately, on top of an X-card-like mechanism. I think the Twitter thread that Sterling quotes is less an argument against safety tools in general and more an argument against a particular class of safety tools. It's perhaps not surprising that the earliest version of the tools available aren't perfect.