NFL meeting to ban hip drop tackles.. (Update: Now banned)

I still don’t understand what this even means. Been around football my whole life and never heard the term “hip drop tackle” until this past year.

How are defenders supposed to tackle someone they’re chasing without grabbing their legs and dragging them down?

This is going to be a mess to enforce.
This is my biggest concern. ANOTHER vague interpretation penalty than can be called "when necessary".