Sorry I wasn't clear. Chrome profiles is a usable UI. Easy to find, switch, manage, create, delete, all with just a couple clicks, never very far away. about:p

Sorry I wasn't clear. Chrome profiles is a usable UI. Easy to find, switch, manage, create, delete, all with just a couple clicks, never very far away. about:profiles is not discoverable (obviously), easily usable (you have to restart), or easily switchable (you have to open about:profiles or the terminal). By the technical definition of "UI", the raw filesystem and terminal counts, sure. Opaque and unknown about: pages count, sure. But that doesn't make it good. For features like this the UI is the feature. about:profiles is not a good UI, so the feature is 80% useless.