It does, actually. For example, the reason why no other browser has the equivalent of Firefox containers is because they are the only ones with an architecture that allows for such isolation. Users of Vivaldi have been asking for containers for years now, and every time the dev team explains that they'd love to do it, but it can't be done without forking Blink and doing some massive surgery on it - at which point you again end up with your own thing, and have to play catch-up every time Google pushes yet another "standard" onto the web.