Because the big craze to offshore everything about 10 years ago, failed spectacularly? Pretty much every coder/manager that was around for that can tell you horror stories.

These might (probably?) have had nothing to do with the quality of the coders - A lot of it was due to cultural and language issues. Things like not realizing what the holiday schedule for a given region is, and 'suddenly' finding out you have a 2-4 week holiday in the middle of your production rollout...