I'm going to have to disagree on that one.

Skewers are designed to provide tension and not support. Many have smooth faces for just that reason. Those riders bending skewers are not getting the wheels set in the dropouts right, and are likely using them for support.

A very tight skewer can hold a rear wheel from sliding forward. I've ridden horizontal dropouts long enough to know that. But, you'll also find many threads about people's wheels shifting in the dropouts. Some are riders with vertical dropouts, and are twisting the wheel beyond its natural position before tightening. Then when they start riding, the wheels shifts back to its natural position in the dropout as dictated by the axle.

For steel/aluminum axle length may not make much difference. Damaging threads on axles? Thread damage to dropouts? I still like as much support as I can get.

For Carbon Fiber, there is a lot of discussion about not over-torquing the CF in most places on the bike. Why not the dropouts too? Especially on older bikes? In other places on the bike, the CF seems to be quite prone to problems with both too much compression as well as abrasion. Now, it might take years to grind out too much dropout, but I'd rather not toast my frame. Actually I have a bike sitting in the basement with CF front dropouts. I'm not quite sure what I'll do with it. Maybe at least find the right axle with end caps so it won't be sitting on the threads. And the stock skewers just don't fit right, only snagging a few threads and getting nowhere near the nyloc.