GitHub's decision to use ldirectord as their primary load balancer was influenced by the expertise of Matt Palmer from the server specialist team at Anchor, whom GitHub hired for their architecture needs. The choice reflects a preference based on tradeoffs rather than a definitive correct answer, and further insights into this decision can be found on Anchor's blog, where additional perspectives, including commentary from the author of haproxy, are available. This discussion highlights the complexity and subjectivity often involved in technology choices.