Scott's closing framing: the real battle isn't Eventide vs. rails_event_store — it's the Rails Way vs. the Design Way. The Rails Way is a bunch of shortcuts that disregard structural design laws on the promise of initial speed; work stays fast for two weeks to three months and then becomes ten times slower than it should have been. Design mistakes happen at an atomic, invisible level (like a cancer starting with a cell); by the time secondary symptoms are visible, damage is advanced. Developers must learn what a software-design mistake actually is and take it seriously.