I upgraded to Sequoia this week and tried out iPhone mirroring - it seems like a cool idea though I wasn’t sure what practical use it would have.
It turns out that DTTG sync may be a good use. I have long tried to figure out solutions to sync a large database with my iPhone given the constraints on how long iOS lets DTTG remain open.
iPhone mirroring seems to be quite useful in this regard. I can effortlessly plug in my phone while I am working on my Mac and set it to Sync DTTG. I can even answer calls and view notifications as it happens.
It does randomly disconnect on rare occasions but for the most part it just works and allows for a no-fuss extended DTTG sync session. This alone to me was worth upgrading to Sequoia.