can you imagine the deck angle/pitch attitude for Vx with all engines running?
15 to 20 degrees would be alot...but imagine you might get close to 23-30 degrees.
anyway...the whole idea might be : you takeoff headed in the direction away from your destination...you want to climb as quickly as possible/angle to get to a place where ATC will allow you to turn towards destination...it doesn't make sense to fly quickly farther away
so you climb at min clean maneuvering
or you leave some flaps out and you climb at min speed for that configuration.
so, nowyou are headed towards your destination and you want to get up high to take advantage of better fuel flow or tail winds...but some ssuper smart guy figured out that the best way to fly is to fly at cruise climb speed as the best compromise for unknowns.
so Vx and Vy are nice to know...but why use them?