That is a seriously ridiculous proposition in my opinion. If you find yourself involved in a project that requires you to hold a "million" lines of code in your head, refer to above point I made regarding "team". Something has gone seriously wrong somewhere if that is the situation.

This should not be news to this audience on HN: proper software architecture, design, and development processes trump "language" any day, any time, any planet. Conversely, even the most 'profoundly correct' language in the hands of unprepared development teams can result in software disasters.

The human factor is still paramount in software development. That is my experience after decades in this profession and is not mere conjecture.