What are you talking about, the q/skewer itself?

Set up right, the q/r skewer will only see tension - being pulled at.
And disc brake wheels and Ti skewers aside, it's plenty strong for the job.
If you're talking about the axle itself, then you're poorly informed.
Rear q/r axles are 10 mm, just as solid axles.
And for bending, the loads are mostly at the outer layers of the axle. The strength lost from using a hollow axle is very small.
I-beams weren't invented for the fun of it.
For a solid axle to be a little stronger than a q/r axle, it has to be made out of equal quality steel.
And since solid axles are often found on cheaper parts, that's unlikely to be the case.
But if you enjoy fooling yourself into a false sense of security, don't let me keep you.