I guess I'll be the first to chime in: steel is real! Not just frames - I also prefer a nice steel fork to the alternatives.
But otherwise fwiw, I have two steel gravel bikes--one is 700c x 40 tubed, and the other is 650B x 47 tubeless. The difference in cushiness is pretty dramatic due to even that tire difference and the psi I can run - about 30 is as low as I go on the tubed 700cx40, but I run as low as 19-21psi on the tubeless 650bx47.
What's your steel adventure rig? I expect it's a perfectly good if not great gravel bike.