TBH I found foam rolling the IT band did F all for me too.
However a hockey ball in the hips and glutes def eases any back stiffness and opens up my hips.
Its a tool.
There may very well be contraindications to foam rolling in some situations. Same as anything in life. No idea what and in whom they'd be mind you?
Cus smoking and tripping is all that you do. Ohhhh yeaahhh