Haven't used MSW, but don't people use it for mocking APIs? Isn't that apples and oranges? If your stories need data, you can always still use MSW. But otherwise when it comes to testing (in the app vs. Stories) I'd agree. Not exactly testing, but the play feature beats E2E if you want to show a smooth demo for clients/fellow devs.
As far as live reload, you're right but only once you've achieved the state. If you're firing up storybook or moving between components, you can already have any state ready to go (or quickly set with the controls). If you're in the actual app and don't have something like Redux Dev Tools, you have to manually go through the steps.... which can be a pain.
That said, so far I'm only using Storybook for the "component library" use case. And for that it's a big improvement from the previous DIY app I had.
As far as live reload, you're right but only once you've achieved the state. If you're firing up storybook or moving between components, you can already have any state ready to go (or quickly set with the controls). If you're in the actual app and don't have something like Redux Dev Tools, you have to manually go through the steps.... which can be a pain.
That said, so far I'm only using Storybook for the "component library" use case. And for that it's a big improvement from the previous DIY app I had.