Hey there! Yup, you’re right – the very latest additions to TIDAL’s music library will be slightly delayed in appearing in Roon. We try to stay as up to date as possible but there is an unavoidable 24-ish hour lag.
The Featured lists are already available in Roon: that’s the “What’s New” tab on the TIDAL page. The Discovery tab is a work in progress. It’s not there already because they added that feature recently, after we’d already built this screen. Expect to see it in an upcoming update.