The front and back do completely different jobs and require different properties. Why would you use the same for both?
They both do an awful lot of steering and braking, the only extra thing a rear does is give traction under power.
I’ve switched about loads of times over the years, generally end up remembering that I want to the rear to have loads of cornering grip too. Maybe it from riding nowt but DH for years, but it’s generally how i end up going. Currently on 2 Butchers or 2 Storms if the weather’s grim. Had a Purgatory and an Advantage on the back, felt compromised when descending. Before all of that I would run 2 Minion DHFs.
If I was looking for a more XC setup, then I’d probably shove something faster on the back. As it is, I’ll keep all the grip.