They really should make the IoT part a module thats easily upgradable. I2S + 5V power is all thats technically needed. Maybe i2c ontop, to make the speaker mode

They really should make the IoT part a module thats easily upgradable. I2S + 5V power is all thats technically needed. Maybe i2c ontop, to make the speaker model autodiscoverable and volume adjustable. But again offering such upgrade modules will open Sonos tech for 3rd party and enable eg. highend manufacturers to cater to Sonos customers or hobbyists to cheaply build Sonos speakers.