I think it's a part of training that should be addressed, but it depends on your strengths as a lifter how important it is.
I'm pretty explosive. I don't feel it's necessary for me to use. I push all of my stes with maximal force. For those that are just plain slow, I think it has it's place in their training.
For those with no muscle, it's a waste of time. You can't flex bone. No need for speed work if you can see or feel bones in your chest, shoulders and arms. It's just like speed training for athletes. if you're weak and have no muscle, speed training is a waste.