It seems my message came across differently than I meant.

Clarifying how I think: I didn't mention QA or anything else because Scrum doesn't have this role, which doesn't mean the team should not have QAs. In Scrum, Developer is anyone who'd get the job done. It could be UX, UI, QA, Software Engineer. Everyone collaborate to deliver value.

Dev Lead is indeed something I don't support. Scrum has no hierarchy. When someone has disciplinary responsibilities over team members, collaboration changes dramatically. I'd say the following, a junior developer should learn from someone more experienced, and most of the times follow the person instead of challenging. Experience, evidence, should talk louder than opinion.

I disagree with you that Scrum Masters are the problems. I'd agree that BAD Scrum Masters are the problem. It's hard to find a Scrum Master able to help the team become more agile and create value faster. Most of the Scrum Masters fail to lead a transformation.