Lack of expandability and no stereo pairing
It looks like an amazing home speaker, but Sonos with an echo dot will likely be able to achieve most of the goals you're trying to achieve with HomePod PLUS the expandability factor, room support, 50+ supported services, and various other compatibility tools
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Not to mention you can buy the playbar today, save up some more money, buy a sub, save up a little longer and buy a Play:1 for you bedroom or bathroom or whatever. If you like music you can't really beat Sonos.