[quintushoratius]

IME (I'm not the person you replied to) a good manager does a few things:

- understands the business requirements for the project(s) you're working on;

- helps coordinate the non-technical parts of projects, e.g. facilitator, finding overlaps, and (when they occasionally arise) dispute resolution;

- works on road blocks to getting your job done.

None of those require in-depth technical knowledge.

A good manager may have opinions about the minutiae of what you're doing, but keeps those opinions to herself. After all, the manager's purpose is to leverage their reporting ICs into getting more done, not doing the task herself.