A/B testing does very little to improve any UX. It's got merits in performance optimization, where the implementation differs but the contract is static betwee

A/B testing does very little to improve any UX. It's got merits in performance optimization, where the implementation differs but the contract is static between A and B, but with user interfaces, it generally leads to pessimizations as usage is not proportional to usefulness. The rare exception is single-purpose interfaces where increasing one singular interaction is an end in itself, e.g. a marketing page, but that's a pretty unique case that is very far removed from a productivity tool.