Author here. Absolutely, HAProxy’s sticktables is a powerful way to implement advanced routing logic, and they’ve been around for years. This series focuses on explaining the broader concepts and tradeoffs rather than diving deep into any single implementation, and since it also covers other aspects of reverse proxies, the focus on load balancing here is mostly to present the challenges and high-level ideas.

Glad you found it a good effort, and I agree there’s room to go deeper in future posts.