Pedigree Query

I understand that a lot of the greats were "difficult" to handle. I'm most educated on how Northern Dancer was threatened with gelding, but E.P Taylor would not have it.

So why was Wise Dan, beautifully bred, gelded? Was he too difficult to be bothered with as a stallion?

I am new to this site so I apologize in advance for being, maybe, in the wrong place. I research Pedigrees on this database and have been surprised and unhappy that the Pedigrees have been reduced to 4 generations rather than 5. I will always now have to reintroduce the 5th generation by hand and wo...