I'd consider doing that if I could rely on the browser not losing state after OS restart, browser restart, unexpected forced browser restart because of some autoupdate bullshit, accidental refresh, automatic unloading of tabs, badly thought-out shortcut for closing the browser window, unexpected update of the web page/PWA into which I typed something, accidental cookie wipe, certificate expiry, lack of reliable form of local storage[0], and a bunch of other things that make me consider
everything in the browser ephemeral unless stored on a server.
(I'm not a browser fan, but even in my weaker moments, this one thing is what stops me from fully embracing living in browser.)
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[0] - AFAIK there's still nothing in the browser one could reliably use to get the equivalent of persisting data to a hard drive. There's like 5 different mechanisms that could allow it, if you could rely on any of them, and of course none of them are user-inspectable except through dev tools.