To the best my knowledge, security patches. I am on the latest 11.14, and on it for some months now, it has not damaged my system that has been running on S1 since before S became S1!

I am on the same boat.

Do you know if a forum or chat exists where users are testing pending S1 updates on say a test environment then providing feedback to other users, who can then role the updates out to their live systems without fear of critical changes? Just trying to keep to the point as we are still updating our systems while not knowing what the update actually is, I mean literally anything could happen as you probably all know now. 

In fact, I think I may have answered my own question. I have a few spare speakers in my garage. I'm going to set up a separate S1 system where updates can be rolled out to that system first, then if nothing breaks, I will allow the update to be rolled out to my live system. If anything breaks I will create a new thread on here or reddit. 

Now that I have seen what updates can do, I have decided to stop updating my S1 units. Why take even a chance of damage for no significant benefit? 

Hmm. Security patches are not a significant benefit?

I can do without them. I don’t care if a hacker sends down explicit songs to my speakers! Too much of nanny state mindset isn’t healthy.

Sonos destroying my system by a careless act of commission or omission is the much bigger risk.

PS: for me the bigger issue is if Spotify does something that prevents my Sonos v 11.4 S1 speakers being visible as target speakers on the Spotify native app. If that bridge appears, I will see how to cross it safely. Till then 11.4 is fine. There are many that have been on 8.4 for years now, with no instance of their speakers being hacked.