Based on your optimism, I suspect that you've never worked on or managed a project of significance using outsourced employees.
Just a few of the realities that you will face if and when you do so:
1) A 12+ hour time difference. I recall nightly conference calls that started at 10pm. If you are somebody who values your time, you will find this untenable. Just use Slack or Basecamp to touch base? See #2:
2) Complete inconsistency in skill and communication ability. It was almost the norm to wake up in the morning and check for the changes we expected to be in place while the outsourced team worked overnight only to be shocked at the lack of progress. One question about a particular detail of the assigned task would bring the work to a screeching halt and we wouldn't find out about it until the next day. We would answer the question (usually inconsequential) and the progress would resume (far behind schedule). In many other cases, work was just done incorrectly and we had to spend the day course-correcting.
3) Lack of talent. After all, the workers who qualify for H1-B's are a self-selecting group who are, by definition, identified as the most talented employees. There is no guarantee that their counterparts who stayed home are able to do the job properly. In my experience most employees were sub-par, as one would expect when they are willing to work for pennies on the dollar compared to a U.S. citizen or somebody on an H1-B.