The states and provinces set their tax rates. Is it Florida's fault that California wants to tax the heck out of people. Gas is $4.89 here and $3.25 in the south. Should the NHL adjust the cap for cost of living? What about cheap housing in a place like St. Louis as compared to Manhattan?
The NHL doesn't need to be in the business of manipulating the cap to suit teams. Then we'll end up with something convoluted like the current US federal tax system where instead of paying a flat rate, people can manipulate the system. While it is an interesting idea in theory, it very quickly becomes unworkable. I just returned from a vacation in Australia. They just cut taxes (their fiscal year ends June 30) to help offset inflation. What if California did that effective January 1? The Kings could have been cap compliant on opening day. But the tax rate goes down and suddenly they are over the cap because their income tax offset goes away. Does Blake have to panic trade players away over the holidays? And, like I said above, if you factor in income taxes then why not property tax and cost of living. The concept gets unwieldy quickly. What if a player gets traded from the Panthers to the Kings? Does his salary get increased? What about the reverse-- does a guy take a pay cut if traded from Canada to Vegas? Why would the NHL want to add complexity related to things they cannot control (i.e. tax rates)? So that they can placate some whiny writers? It is never going to happen. Players already game the tax system getting paid big bonuses rather than salary.
FL/WA/NV/TN/TX didn't cut their tax rates to zero in 2020. The difference has always been there. Yet, the zero tax teams were mostly terrible 2010-2019 while high tax teams in IL, CA, MA, etc were winning Cups.
Last, what about the Canada exit tax and how it kept Tanev north?
Chris Tanev on his homecoming with the Maple Leafs: "Winning in Toronto is the ultimate goal"
If a guy plays in Canada for his entire career, then he's got the golden handcuffs on when it comes to picking between a Canadian and US team.