The downside is that if you don't keep buying the new systems even though the old ones work perfectly fine, eventually your device will get too old and you will be categorised as a legacy customer. When that happens, your shit will stop working.
https://www.theverge.com/2016/4/4/11362928/google-nest-revol...
That's the future. The dude with the 80's hifi setup knows what's up, in my opinion.