Are many/most users of Auralic products using Roon and Lightning DS concurrently?
Why would you use both? Short of accessing a streaming service not supported by Roon I can’t think why you’d be switching between the two.
Re music streaming - it is a either/or choice
But Lightning DS is still needed for any hardware or chipset related setting re your Auralic device and/or firmware upgrades.
I use Roon almost exclusively. I access settings, etc. via the web inteface. I never use LDS for music library or playback. I don’t even have an iOS device to do so.