Yes i think this is greed by Sonos. I have 15 Sonos units mainly s5 units in my house which sonos have not totally devalued to Zero. I will now never ever buy Sonos again and would certainly not upgrade on a point of principle. I am positive a small cheap tweek to something inside would upgrade this kit so it could still work foe decades to come. But no greed and stupidity has taken over by Sonos
Sonos need to thank customers and give them discounts the more units you have in your home, not make your investment drop off a cliff edge due to greed and stupidity on their behalf.
I am in total shock and disbelief if they truly get away with this lack of support on these units they have sold at great cost to us all.