Some Elefants survied till the end of the war, so this should teach you about their importance. Which other combat vehicle lasted 2 years under fire with little spareparts in that small numbers? I doubt any allied tank get's even close. Plus those few tankdestroyers destroyed hundreds of tanks and fieldguns in Kursk and battles after that.
Ferdinands/Elefants are a must! Hope to see them in 0.66 soon.