Soft sorta dampens the quickness of a turn, I guess you could say, most Indy type riders like that as they always have them stock.
It's actually harder to find soft readily available after market pivot cups than hard ones these days without having to place an order online.
Just found out that the Indy aftermarket ones are NOT the stock ones, they are the hard type you see everywhere, I found this out when I ordered some from SoCal and got them and was like "wtf are these"?.
They told me that's what NHS sells as the "genuine" replacement part and that they are a better grade pivot cup than the stock ones.
Weird as they are 2 very different things - hard and soft, better or not. Indy's have always had soft stock cups so hard ones will make em turn say, I dunno, less Indy?
Oh well, I'll find this out soon.