This author built a web game called "Binary Duel" using only Go and claimed that features like a cache, queue, and database weren't necessary. However, he admitted that his initial claim was premature and wrong. For better user retention, he decided to add features like a database, login, leaderboard, and ranking system, using Go to implement solutions like in-memory caching and bulk database writes efficiently.

This developer expresses their fondness for Go but also lists features they miss from other languages. They find the lack of ordered maps in Go's standard library inconvenient, requiring developers to use third-party implementations or manually sort maps. The developer also misses keyword and default arguments for functions, which would simplify function calls and improve API design. They also wish there was lambda syntax in Go.