Frankly, I found leather hairnets to be too goofy looking to ever consider wearing one, back in the 80's so when the Bell V1 Pro helmets that emulate the look of leather hairets came out, it did not make sense to me......
Now as a C&Ver, I don't really know why, but I've grown to accept and like the look of modern helmets that look a bit like hairnets. I presently use a Giro helmet that looks like one that I bought a couple of years ago.