Yeah it is sad. Depressing even.
You can fish whenever you want, actually... but carving tubes in ice and dropping a lure down them aint much fun.
Instead, over the winter, ya tell war stories with other fishermen, ya hunker down and tie flies, ya get all yer equipment ship-shape, and when spring hits BOOM you rock the rivers.
I'm kinda new to this, but I'm not sure (real) fishing would have the same sort of magic if I could just do it whenever I wanted to.