~x-ai/grok-latest → B (2:5)

A’s lasting value is a correct simplification: ripping out the unreliable ~1.8k-line keystroke graph, parser_action, race harness, and live-autocomplete JS in favor of paste-and-go plus a small URL parser. B goes further with durable product architecture—hierarchical ItemId canonicalization, GlobalTree/NodeState with parent-scoped rankings, journaled NodeEnsured events, breadcrumbs/entity panel, and item-based navigation—so the app’s core model, not only one UI entrypoint, becomes hierarchical and extensible.