I think you nailed it. Sonos may not be the last word in accuracy, wide frequency bandwidth, vanishing distortion, or SPL capabilities, but for 90%+ of the market place, they make a suitable product and offer very decent product support.I've said it before and I'll say it again, Sonos is more than good enough for most people. Luckily Sonos is not only popular, but has their heads on straight when it comes to sound quality, at least as far as their design constraints go. It's not "true" hi-fi but it's far from a disaster like Beats was at first.
If want people to invest in good sound beyond Sonos, we need to figure out way to make them care about it. Most people are interested in music, but not sound per se.
Even for those of us who are chasing that last couple of percent of performance, Sonos speakers don't suck and can be quite satisfactory in our less critical listening areas.