you realise proper mountain bikes are using 2.4-2.6inch wide tyres? I'm not talking about trail bikes, also your rims on a gravel bike have to worry about what's under the water, mine don't because MTB wheels have reinforced and thicker sidewallsgravel bikes these days take 2.1" tires, same EXACT tires that MTB's take, so the traction/grip is pretty much the same, latest ones even come with suspension forks? how extreme do you want to go. Yes an mtb is better on big fat off road downhills and trails. Gravel tho, is better as an all-around bike.
What's your ground clearance from the floor to the bottom part of your bottom bracket?
you know those paths that have the bike gate and the other bit next to it for horses.

can you ride over it on a gravel bike? I can ride over them at 5-10mph like it's just a branch or something across the path.
there's no way a gravel bike can compete with a mtb when it comes to riding through any paths with big puddles/flooded areas or thick mud, which is going to happen soon, people will start wearing wellies etc even on your "gravel paths"
MTB is also running a lot lower tyre pressure which makes going over any unseen obstacles a doddle because our chunky tyres with thick tread are more like tank tracks, they don't try to bounce off things or get stuck on them so easily.
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