We rarely analyse Desktop and Mobile together for a website as experiences are very different for end users (need, available time, screen space ...). We can always adapt a new optimization differently for Mobile. Tha's why it's very important to us to seperate our analysis by device AND compare it easily.
When comparing, we want to directly land on it, not to click 6 times to get it like today.
If our fellow CROs don't feel the same, maybe add a toggle to easily switch ON/OFF this option on the report page?