I'd be more inclined to say one of the main roles any manager is facilitation more than anything else. Any manager that "sets convention" is somebody who wants the easy part of technology without the corresponding hard part.

Talking about technical solutions is easy. Implementing it is much harder.

I've come across multiple "technical managers" who were hands on with code greater than x years ago and they always end up talking out of their arse. And that's not to mention the numerous wrong choices they've committed to/spoke about at a high level meeting with zero notion.