That's actually a false dilemma. Both are compatible goals. The idea is that the more people with these skills, the more innovation can come from it.

On that note, I don't believe "sacrificed quality" can come from an influx of more engineers, junior or not. Rather, a larger base of junior engineers has the opportunity of increasing the capability of existing senior engineers due to the paradigm of mentoring.

Here is an article (posted to Hacker News some time ago) that I often reflect on: https://medium.com/@melissamcewen/who-killed-the-junior-deve...