That doesn't make that much sense. The US isn't sending Ukraine their advanced weapons, only old and/or moderately simple equipment. HIMARS is the only interest

That doesn't make that much sense. The US isn't sending Ukraine their advanced weapons, only old and/or moderately simple equipment. HIMARS is the only interesting one so far and they've given short range rockets. I think for the Western military it's the intelligence about the state of the Russian forces that has been invaluable. But they know now, so it's not of much ongoing use.