Trust them with spending thousand and thousands of dollars and continue to offer a product that works. Why is that a question? Do you buy a dozen $500 pieces of sound equipment and replace it every year?
You clearly haven't walk into any new, above average price home. Someone, somewhere has decided that every single room with ceiling speakers should be individually controllable, which, to be clear, is exactly what Sonos pushes. An Amp doesn't even put out enough power to properly support more than one room.
We use a port right now, it works just fine.
Best in class at what? Selling overpriced equipment? They used to offer something that no one did, now everyone does it. It's not worth $5000 so twice a year a friend can add a song to our playlist while we're having a party.