All other assistants are useless turds as standalone devices on the great scale of things, but Siri Home + homekit + home app and new features has the ability to be something more, something that in few years people can't live without.

Alexa will eventually crawl back to its cave because it is built in to the biggest ecosystems, and Google hasn't done anything relevant as far as hardware products and initiatives in ages. They are obviously going to gain steam (like everything else) once Apple puts the industry rolling. Accessory makers won't put all their eggs under the apple basket, but just like accessories, payments and so on, that's the basket that can change and improve things. The other basket is the good enough, "me too", "hey it's cheaper" basket.

AI was the last advantage that Google had, and they botched every implementation and everything so much that no one uses it at all (targetting a tiny minority of Android users that just don't care, botched allo, no one bought the pixel), no one cares about it, no one develops for it, so Apple has the open door with siri.