The bigger the tire, the lower pressure you can run, which makes it more comfortable over rough pavement and trails. This bike has no suspension but I'm still able go over big rocks, roots, etc. comfortably if I drop the pressure. I ride trails but not aggressively/getting air or anything. So I can ride pavement a while to get to some trails, drop the pressure and have a good time off road, then air up and zip back home. And no suspension to deal with/maintain (+ can run cargo racks front and back if I want, which you can't always with suspension).
It's a trend/rediscovery of sorts in the "all-terrain bike" hype-sphere (but I do like it)
I don't know anything about bikes, but this one looks pretty nice! I'm jealous. I'm glad you're loving it!