That feels a little “no true scotsman” to me. Like sure, if implemented correctly, Shift Left isn’t “developers are now also testers and can sign off on stories

That feels a little “no true scotsman” to me. Like sure, if implemented correctly, Shift Left isn’t “developers are now also testers and can sign off on stories”. But in practice, it often becomes that. And while some may say that “that’s not Real Shift Left”, I’d argue that if a practice works great if you do it right but almost always fails the same way when you actually try to do it… well, that’s a problem with the practice itself.