Yes, it is very bad decision.
This is also discussed here Roon 2.0 and internet connectivity [it's just like 1.8 now]
And there is also a feature request which people can vote which is similar to this. But, somehow it is not combine. So the number of votes is split into two threads
https://community.roonlabs.com/t/make-roon-play-local-music-files-w-o-internet-access/214998
Hope they will bring back functionalities when offline. I cannot understand why Roon at home cannot function at all when the Internet is down.