“What do people think about the workaround for Roon using HQPlayer which is used in the LinQ?”
You can buy and download the HQPlayer license ($299) on your Mac Mini. As you may know, Roon can be configured to implement HQPlayer into a Zone. Once you do that, HQPlayer becomes the Audio Engine and Roon is just passing along a stream of bits from your local media files / Streaming services as Qobuz and Tidal. This allows you to enjoy the benefits of HQPlayer amazing SQ and the library management capabilities of Roon at the same time.
I just bought the HQPlayer license recently and I am amazed by the improvement. To my ears, it’s worth the upgrade over Roon audio engine which is pretty decent but HQPlayer is whole another level.
As far as LinQ goes, only your ears can decide if it’s worth the upgrade over Mac Mini, once you’re ready to audition. That’s the only way to know. If I were in your shoes and owned AQUA DAC, I would wanna audition LinQ at some point.