what am i missing in the celebration?
HB102 [link], doesn't do much for open carry since open carry has had minimal if any restrictions with the state for quite some time already.
It does do quite a bit for conceal carry, it enables permitless carry (constitutional carry) statewide, removes prohibited places and better enables campus carry. While they aren't open carry focused they are still big wins worth celebration for Montanan's.
The celebration for open carry in Montana came with the Jan 1 effective date of LR-130, which adjusted state preemption statue's to remove the ability of local governments ability to restrict firearms in certain places such as parks and public assemblies.