Up Front: I LOVE all my Sonos.
But: I bought them fully understanding what they were, and for that, I think they are for streaming Internet Audio from internet sources. Frankly, if you want Audiophile quality, then these aren't the speakers you are looking for.
I'd also arguably streaming from your local network is also a secondary purpose, in which well...again, you've got to know what you're buying.
If I want to listen to high fidelity, I'm going to use a component system with quality speakers and a solid clean amplifier. If however, I'm wandering around the house listening to Pandora, well, the Sonos is more than good enough.
As for "low quality junk", that's a bit subjective I suppose. For what they are, I think they are solidly built, and in my experience, they "just work".
Pricey? Yup, asbsolutely. Are there reasonable other options? Perhaps. I've not ever been a real fan of Bose sound, but a lot of people like Bose, so there's one option. Are Bose cheaper? Not in my experience, but that's based on my noise cancelling headphones, not any speaker experience.
For home automation speakers? With certain limitations, they work great.
If one was considering them for that purpose, I'd recommend the Symfonisk speakers at $99 each.
As for planned obsolescence. Yup irritating. Sign of the times. Having said that, my oldest useful Sonos is >5 years. Conversely, there's not a cell phone in my house that's even close, and my "Mid Range" cell phones certainly cost more than a Play:5, so I guess it depends on how you calculate value.
Just my opinion, but I think (for the most part) they're worth what you pay for them, particularly at the Symfonisk/Play 1 SL end of the range. I want them for background music though, and absolutely don't want Amazon/Google Home stuff built in. So, my requirements are no doubt different from others.
For the record, I don't like the "planned obsolescence", I don't like the choice they've made to focus on Amazon/Google integration over sound/cost...but so far, I've not seen or heard anything that works as well, and sounds as subjectively "good" as Sonos in the use case I have.
YMMV!
S.