I used to commute on bike every day, regardless of weather in rain or harsh northern winter conditions. Waxed fabric is an interesting idea, and I might try soy wax on my shoes come to think of it. However in the past I had tried to use a rain poncho while biking and found that the flappiness rendered it completely useless in the rain.
Technically it's not gore-tex exactly, but I got a Columbia brand rain jacket that uses an equivalent technology. It is probably the best coat I've ever had for both rain and winter conditions (as long as I dress in layers), and even 6+ years later it is still entirely rainproof.
Oh it's you again, I didn't even realize in either of those cases. Well stop having bad takes about animals, and start doing right by them. They need you.
Gore-tex is much better than animal skin for being both wind and water-proof, and better for breathability as well (and being much lighter weight). While the materials are bad environmentally, animal skin is not an environmentally friendly material either.
Leather is not a byproduct. Virtually no one is raising cows just to be nice. It's a business, and no business is going to waste resources on unprofitable "assets". This means the cows are raised specifically for their skin (in the case of the leather industry), and they are killed while still young. The same is true for both the animal flesh and dairy industries - older cows are less profitable.
So to accurately compare it to humans, imagine a bunch of babies and young children being confined in cramped, unsanitary conditions, regularly getting abused, and then being slaughtered long before they ever had any opportunity to do anything with their lives - having only ever known suffering and abuse.
I've relied heavily on gore-tex style rain-proof outerwear for being outdoors in bad weather. Their breathability and water-resistance is miles ahead of dead animal skins.
Your characterization of events is inaccurate. We have hypotheses about what happened to the megafauna in the last epoch, but nothing proven. Humans probably did hunt them, and it very likely could have played a large role in their extinction. But it wasn't the only factor, nor even remotely the largest. For starters, it was the ice age. It's a pretty safe bet that those conditions would have been the most significant factor in their extinctions.
And it's also the most significant factor when thinking about what humans ate at that period of time. They were pre-agrarian, and living in an extremely cold climate where plant life would have been much more scarce in many times and places. What humans eat in the most extreme circumstances is irrelevant to what we still had the largest tendency to consume throughout history: plants.
It's possible to believe that both individuals and corporations have wrongdoings they are responsible for fixing. If corporations disappeared and your preferred magically ideal socioeconomic system prevailed, it would still be unsustainable if everyone were still omnivores.
I have a reply to that comment nearly finished. Just had to break out a device with a real keyboard because it's lengthier.