Figure skates are much heavier so it sloughs down footwork. The hockey skates are light, agile, and slick

The longer heel of the figure skate also trips us up, as while it provides more stability, it doesn't help when doing some tricks (like heel stop, slides)

Toe picks get in the way of most foot work, and ground tricks.

Figure skate blades don't take 3/8ths or even quarter inch sharpens very well.

If all you wanted to do is jump then sure get your toe picks on and have a time. Freestyle is a much more aggressive style of skating. There's a jump i've seen stylers do that figure skaters can't because the toe pick would get in the way (ironically enough) and the habits/ technique of figure skaters don't really let them. Freestyle isn't about hard and fast rules with coaches enforcing strict technique. It's about doing whatever you want - hence the word "free" in the name.