conversion phase

I was reading through my forum review and Charlie metioned something I had a question about. He stated that not all sports need a conversion phase. What I want to know is how do you figure out if your sport needs one or not?

Others could go into greater detail with this, but Charlieā€™s theory goes that since faster weights have almost no more specificity speed wise to sprinting they are pointless, but for something like shotputting when the weight speeds could come close or even match the speed of the shotputter it could apply.

However he did say that no matter what weight his athletes were lifting, they were trying to lift it as fast as possible.

And how about using movements which are faster by nature rather than using a faster/lighter version of a heavy slow lift, in order to increase RFD, such as Olympic lifts and variants?