That's an interesting point because some people will prefer narrow knobby tyres in deep mud or sand and ride the ruts like they do in cyclocross or some people will ride the soft on big/fat tyre like beach racer in NL riding 55-622 or 60-622 slicks

personnally, my favorite gravel tyre is a XC tyre conti race king in 50-584 (since 2020)because they roll so well and if the terrain is getting looser, I put a cross king on the front ( better steering grip and little rolling penalty)
If MTB muddy, 52-584 mezcal rear and barzo front.... they don't roll on tarmac but grip very well on trails