Let's be honest, this is requirements for a senior engineer, not a tech lead. It would, of course, be nice for a senior engineer to have perfect awareness but

Let's be honest, this is requirements for a senior engineer, not a tech lead. It would, of course, be nice for a senior engineer to have perfect awareness but I think that is too much to ask to qualify to be called senior. Have you watched Star Trek (DS9 for example) lately? You may have a bunch of senior officers but they still do not always understand why stuff needs to happen. They muddle through on principles until they succeed. Then it is always easy, retroactively, to say it was their idea all along.