First I'd say that when it comes to extreme use boots, you have to find the brand that fits your foot. Kenetrek fits mine.
I have the 400Mtn Ext and the uninsulated Hard Scrabbles. I use them a lot for mule deer and Chukar.
I have NEVER had my feet get wet from moisture, but have from sweat.
I find the stiffness just right to allow me to hike, but give me the stiffness I need for walking across the shale I often find myself in in the high country and bird hunting.
I don't find heat a problem hunting, not even chukar. Some might, but you will trade durability of this quality thick leather for either thinner leather or some other less durable material.
I have had to have my boot reglued. The service was good, but not like Swarovski, where everything is for free. They reglued for free and shipped back for free, and threw in new laces for free. Now, I bought these boots in '14 for my Mtn Goat hunt, and have put on about 1200+ miles on them. Many on dirt, walking the dogs, but about 25% in shale, granite, or some rock. The soles are still 50%, it's just the toe kick that is giving me problems and just last week the girl that took them in for repairs emailed and said she believes they would give me a "credit" toward new boots, but I have to send them in for inspection. I'm going to give them the benefit of the doubt and say this is good service.
I will note that they are quite careful and have been very vocal about not exposing boots to extreme heat like from a camp fire or drying them in an over as it ruins the glue. I have been diligent about this and let them know that upfront. I think that has been a lot of the historic complaints.
In the end, every product has a useful life. Try on whatever boots and really wear them and consider how they fit. Any rubbing is death. I lace mine a special way and have ZERO problem, but honestly, even slight changes in lacing and a steep incline/decline and I can notice a difference. Become and art, but literally no blisters in 7 years of hard hunting.
PS Unless you sit a lot or hunt below 20degrees a lot, go uninsulated and make sure your boots aren't too small and I think you will be better off.