I don’t know if they’re well suited for gravel, but I do know if you take a gp5k 32mm tires & put them on a FLO G700 gravel wheelset it’s very, very aerodynamic. If you are looking at a long day on chipseal that’s a good setup. For a day of bad tarmac there probably isn’t a better setup.
Also fast on the gravel but maybe not durable enough to be a true gravel wheelset. But super fast among wide wheels.