Nice! Now the disclaimer… Running without a firewall could be risky. Only you can decide your level of risk in your environment. But, at least you know if you want to put the firewall back you’d need to modify it to support Roon.
Here is a thread, there are others, of an example configuration from another user if you want to turn the firewall back on but still have a working Roon…
Note, the ports Roon used changed earlier this year so don’t go back too far in thread age or it won’t work. It also should be expected that Roon port usage will change again which would require additional rule updates.