Early TSX hardware from Intel had unfixable flaws. The problems were fixed in later CPUs but that left the burden of detection on developers. Then along came

Early TSX hardware from Intel had unfixable flaws. The problems were fixed in later CPUs but that left the burden of detection on developers. Then along came side channel attacks and TSX became a vector for that. Plus it's Intel only, so you have to use another approach on AMD, which has completely distinct instructions, and this is an area with extreme subtleties where you really don't want or can't afford to deal with multiple implementations. In other words it's been a total shit show. It doesn't have to be, but until Intel takes it seriously and produces a unflawed and secure realization it's going to continue to be a shit show. Even then you're still left with the Intel != AMD problem...