I’ve only been at it 30 years, but the exact opposite is true of me, my feet sweat profusely, even in flip-flops. Perhaps a testament to how different feet can be person to person.
When I was 21 I went barefoot Jan-Apr as an experiment. Snow and cold didn’t bother me, ice fishing my feet got cold on solid ice after about a half hour.
I tried on Kennetreks MG at the store and they were far too stiff for me. It reminded me of the iron boots in Zelda Ocarina of Time. OP, if they work out for you, great. If not, don’t be discouraged. There are very different fit and feel boots out there to try out.