I'm seeing the same thing as Slaists in an ERE campaign I started a couple of days ago. Between me and WRE ally, I can see most of the map; 30+ turns in, I only see 4 desolated regions across all of Europe (5, counting one that I resettled early). A couple of those regions, moreover, I suspect are abandoned settlements by factions who decided to pick up and migrate, rather than razed by an attacking faction.

In my 3 previous campaigns, I would've expected to see half of Europe burned up by now. WRE appears to be holding itself together a lot better (on the strategic map, anyway), but I think that's because they're still retaining nominal "control" over a bunch of sacked settlements that would've been razed pre-patch.