As another commenter alluded to, good Smarthome tech becomes an appliance, which isn’t a desirable high margin business, and bad tech becomes a nuisance which is also not a desirable business.
That’s why Google is slowly getting out of it and shifting their focus from Nest. That’s why Apple never did much beyond a few speakers, and it’s why Amazon is right at home in that business (but even they’re getting out of the money-losing voice assistant aspect).
Robotics… seem like a miss to me. Very few tasks at home are as simple as vacuuming, but maybe I just lack the creativity and vision. Apple surely has some great tech left over from the car R&D so who knows. Apple is unfortunately not great at a “communal” perspective when making things.
I think a big issue no one talks about will be robot storage/garages. It’s already an issue for Roomba and anything bigger will be a no-go for many households. That is probably apples best chance - make it pleasant to look at and a status symbol.