Last year, I came real close to blowing some unforeseen discretionary fun money on a Giant TCX. But alas, the wheels were hookless, and I could not be bothered negotiating a wheel swap. There are lots of other nice cross/gravel bikes out there.

The major problems with clincher rims in general is the 'hooks' required to hold the tire bead in place. The hooks are sharp and cause pinch flats, and are heavy at the worst place on a bike. So I can see the motivations to reduce them as much as possible - hence the residual stubs on hookless rims. Nevertheless, there stubs are still there, in contrast to the tubular rim profile, which is optimal in terms of strength.

With the tubular rim, at the expense of a few grams of glue and you get no pinch flats, a rim that can withstand immense compressive forces from rim brakes (in contrast to clincher rims), and a rim that is far more resistant to impacts. Plus it is lighter, and the rim is isolated from tire inflation pressures, so you can run tires from basically zero to whatever will cause the tire to explode.

So I don't get hookless, at least for competition. Tubular is better in every respect.