The most needed rule in hockey that I would change is to the 3-2-1 change that international leagues and the PWHL do. It was amazing this past season to see the scenarios of teams pulling their goalies late in games that were tied or even in overtime because they really needed the extra points, and I think something like that could really spice up the late-season playoff races. The current 2-1-0 system doesn't do a very good job of representing a team's actual talent level in my opinion because their wins could either be really convincing multiple-goal victories or overtime nailbiter. A standings record should be arranged in a way where I can look at a team's record and say "that's a good team" or "that's not a good team". As it is, the 2-1-0 system misrepresents teams' success and incentivizes them late in games to just play for the safe minimum point unless they're in an absolute crunch time scenario where they need to earn the second point, and robs us of late-game dramatics.