> Data structures, not algorithms, are central to programming

So you agree that they should've designed the system to use the appropriate data structure from the beginning?

Notice rules are ordered. You don't optimize until you know you need it. They started with a data structure they though would be fine. Clearly it was fine since it worked and they decided it was later worth optimizing.

The existence of 1.1.1.1 speaks to a much larger design problem. If you want to talk about what should have been done, you need to step much, much further back.