Sealskins are fine you just have to wear them as part of a who;e winter set up….. I use sealskins and they're fine aslong as I wear them with bib longs over the top, then MW80 boots then if it's really cold and wet, my endura overshoes……
You can't just wear sealskin socks and shorts as the water runs down into them like a drainpipe…..
Aslong as you take measures to cover the top then they work just fine…
Waders are fine for fishing but if the water gets over the top then they're useless 🙄