"don't explain too much" is an excellent bit of advice for any technical discussion.

Of course it goes without saying that you don't misrepresent the situation, talk down or over simplify, but excess explanation so often moves the discussion away from the critical point at hand. If your listener wants more info, by all means provide it freely, but don't unnecessarily muddy the water.

Part of the job of a skilled tech person is to strip away (through intelligent analysis) all the complex detail and reduce a messy problem to its critical aspects. It's the inept technician who can't reduce the problem to core principles.