If the difficulty of the LC questions were calibrated for the role, I'd agree. But the times I've run into LC it was rarely the "easy" questions. Instead I've seen LC questions thrown at me that would take someone already familiar with the solution a couple hours to implement, but I'm going into it cold and am given 30 minutes with someone watching me. Or worse, I've seen LC questions that were once the basis for someone's CS PHD. It might have taken Dijkstra 20 minutes to come up with the algorithm he is most famous, but you're not interviewing Edsger Dijkstra here.