This is also why they recommend not to use polarized while cycling, it can obscure slicks or water in certain sections. I still use mine but I know it's not as ideal as photo chromatic lenses.
I've never heard that. I tend to buy photo-chromatic sunglasses due to them changing quickly to clear when it's cloudy/dark or in a tunnel or, more accurately in the UK, they go dark for those few minutes of sunshine we get per year.