Also, on a desktop, some websites are just more naturally run in their own separate window than as a browser tab because you frequently need to switch to/from t

Also, on a desktop, some websites are just more naturally run in their own separate window than as a browser tab because you frequently need to switch to/from them: e.g. ChatGPT, Gmail, Google Voice/Keep, MDN docs, dictionaries. And you can put the PWAs in full sceen mode, whereas full-screen mode in a regular browser is almost always pointless ever since they took away tab indicators.