I use 20# all the time during the open water period walleye fishing… as a matter of fact, I use it panfishing too, unless I need to scale down for finicky fish… then I’ll still use 10#… I might catch less fish, but with the nearly all the time more aggressive approach I take fishing, if the rest of the boat starts catching more than me, I know when to scale down.
During the ice season, I tip-up fish with 20# just in case a toothy critter comes a long. But the fish I am fishing for I am using 2# mono…
Mark