Speaking of HIMARs the Pentagon anonymous briefing was explicit today on why they really matter. These are not to be compared to traditional artillery or presently anything the Russians have that seems to be working.
https://twitter.com/phillipspobrien/status/1539962574803836928
These are longer ranged and far more accurate. Both these factors are massive effectiveness multipliers. Impossible to put a number on it, but a working HIMARs system is far more valuable than a large number of traditional howitzers. 
Ukraine does not necessarily need masses of HIMARs to compete with Russian artillery mass. They need a significant number and, maybe more important, the right ammunition with the most range that they can get. That’s why they are so important
Adding this here, at present US is limiting the ammo to 40 mile (60 km) range. Thats longer than any accurate Russian system that seems to be operating. And the US can send longer range ammo if they feel it’s needed.
https://twitter.com/JackDetsch/status/1540329581210734592
Ukrainian armed forces @GeneralStaffUA have released their first video of the HIMARS in action. They seem pleased.
https://twitter.com/generalstaffua/status/1540732307736145920
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