Can someone explain the advantages to me?

Yes, but a thought - the reason why Sonos needs more of such support is because it is, as is always pointed out here, a networked computer system that just happens to incorporate speakers. And the consequent need for this support is the price paid by even those that do not use Sonos’ multiroom groups for any of their listening - the aforesaid networked computer architecture is still present to support the unused multiroom groups feature for such users. Would such users then be better off using another system that does not do groups, or does not do them as well, but also needs far less support? My Sonos system is now as stable for music play as my Echos, but it took some work to get there. The Echos needed none of that work.

It's may be worth noting that SonosNet is helpful to playback performance whether Sonos is used with multi-room sync or not. The speakers collaborate to provide the best possible network path/throughput to any device that’s playing.

Of course, it’s always possible just to use Sonos on WiFi (without SonosNet), in which case it’s the same as competing systems anyway.

I’m not sure Sonos is worse than any other technology product in terms of its support challenges. Most Sonos users probably don’t even know that this forum exists.

With reference to Sonos net, to my surprise, this is what Sonos Staff said in another thread a month ago:

Considering that we now no longer consider SonosNet a preference, but simply an alternative,

I suppose this is because home Wifi is much better now than it was when Sonos launched, with a more robust coverage possible across the home.

Also, Sonos architecture is designed for the original use case back in 2005 - of using a single local NAS to play different music supplied by it, in more than one room at the same/different time, and to also play the music in perfect sync in all rooms when needed.  

For a use case where streaming services with family plans have made a single local NAS as redundant as Sonos made CD players back in the day, and where multi room grouped music isn't a big need, the simpler architecture used for Amazon and Google home wifi kit where more coordination work is done in the cloud, automatically translates into lesser support challenges for the kit at home - with this kit not needing to be networked computers in constant communication with each other - as they are in the case of Sonos. 

PS: a copy of something another expert said here a month ago: any device which simply connects out to the internet asks a lot less of the local network than a system which depends heavily on device-to-device communications.

Device in the above case being the Amazon/Google kind of speakers.

issue got solved!!

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Now he tells us...

No. He’s posting spam links.