Black switches activate at 60 cN. The blues' tactile bump takes 60 cN to overcome. My guess is that if you don't bottom out, blacks and blues require a similar effort to type on. The nice thing about blacks is they go up to 80 cN at the end of their travel, helping prevent bottoming out. Some folks with sensitive joints/tendons use blacks for that reason. The Maltron super expensive ergonomic keyboard, specifically designed for heavy typing, uses black switches.
At the end of the day it comes down to personal preference and work habits, and for some folks black switches are ideal for typing, so they are certainly worth trying out!