You're comparing "expensive custom solution" with "free off-the-shelf solution" when in reality it's "expensive custom solution" vs "expensive off-the-shelf sol

You're comparing "expensive custom solution" with "free off-the-shelf solution" when in reality it's "expensive custom solution" vs "expensive off-the-shelf solution". Source control at Google scale is difficult and you can't just wave a magic wand and make that complexity go away.