I absolutely agree with you. The ubiquity choiche is because of the price. Small business Cisco are 5 time ubiquity price fActor. Meraky almost 10
You can as I can see all my Chromecast devices form different subnets on my ubiquiti network as long as they are all set as corporate network and you enable mdns it should be ok. Unfortunately Roon does not see anything outside of the servers vlan regardless. 
You miss the point, you need to route multicast groups for upnp SSDPā¦ . not difficult but you need the right equipment and know how networks work. You also need to set static routes up unless you are using simple connected unicast routingā¦ no good for Roon or upnp.
I know itās all elementary, but if you have not done it before it might not be obvious. Itās definitely not plug and play however.
Roon should route when you set up multicast routing and PIM as you expect it would, I canāt remember which multicast group address it uses And donāt have it to handā¦ sounds like you might not have configured your router correctly or might not support the required functionality.
Ubiquiti switches have a setting apparently called IGMP Snooping->Multicast Router Configuration which allows route multicast between vlans, but I have no details of how and what it actually implements.
You can still do it on the unifi stuff via cmdline itās not in their GUI. ChromeCast stuff is as all you do is enable Multicast DNS and it works across vlans. Roon does not support seeing devices across vlans support have confirmed this itās by design. Much to peoples annoyance. If it did then getting a vpn working with Roon would be a snich but itās not.
Remember VLANs are simply seperate subnets whose frames can be trunked together and are identified by their VLAN identifiers, typically 802.1Q tags are used ā¦ as far as switches are concerned these VLANs and their associated tagged frames are completely seperate from each other. The only way to go from one subnet to another or one VLAN group to another VLAN groups is to route. You have unicast routing of IP and multicast routing of IP groups and they use different techniques.
Your L3 switch or router needs to be instructed on how to route between subnetsā¦ you certainly wouldnāt want it to automatically happen on most equipment as chaos and potentially security issues could ensue causing network failure. mDNS uses a multicast group IP address that effectively broadcasts to all connected devices on the subnet which then respond with their mDNS host name so they can be found independently of using a DNS server.
Now on some devices you can allow connected subnets to remote without having to specify to muchā¦ it sounds like on the Ubiquiti device you may be using their Chromecast discovery/ mDNS helper (reflector) as their special case to route the mDNS broadcasts across the switch.
However if you had set up multicast routing using PIM as opposed to perhaps a simple helper, then Roon discovery and UPNP SSDP should also route between subnetsā¦ the media would route via unicast routing.
Remember routing is not down to the application, but the router functionality and configurationā¦some people perhaps get confused by thatā¦ so itās not a matter of it being supporting by Roon, Chromecast or anything else, itās transparent to them, itās how you configure your network equipment to process the network protocols.
Just about anything can be made to route across subnets using a capable router ā¦ some applications are harder than others to configure depending on what network protocols the applications use. Hence why I recommend a used Cisco 870 or similar ā¦ they are cheap, end of life, and quite versatileā¦ and you can configure them as a ārouter on a stickā using trunked VLANs from your switch
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