[hvs]

FTA:

  Once PRs start to exceed 10k lines of code, they seem to become slightly “safer.”
  I suspect this is because the extreme end of PR sizes includes refactors, which
  maybe start including less functionality change and therefore have a slightly
  lower chance of breaking. Alternatively, engineers may become progressively more
  reluctant to revert PRs after 10k lines because of emotional anchoring and merge
  conflicts.

[tengbretson]

I would speculate that PRs of > 10k line changes are more likely to be deletions of entire modules or assets that were dead code already.