Edge has a feature that lets you install websites as PWAs, which appear in the Start Menu like any other app. I assume they plan to have people use Word Online that way.
Whether or not this will be set up automatically is a different (and more important) question. But if they don't do it automatically, it's something that would only need to be done once.
True, but that assumes that the people filing copyright lawsuits know the law and are acting in good faith. And that the recipient does, too.
If I'm an artist living paycheck-to-paycheck and I get a copyright-related cease-and-desist, I probably won't have the money or time to fight it even if I know that it's wrong.