They did the current system to cut down on cross time zone travel(also why the 80's format came after 1-16). That doesn't matter in the East, but Eastern teams cried about Winnipeg being there for a couple years. Dal/Col, or LA/Edm, if it's 1-8, the time zones are the same, but if LA and VGK, Wpg and Dal get to the 2nd rd, the travel gets cut, instead of Wpg/LA and VGK/Dal.
This is why I say the two conferences, if they must remain separate(because 1-16 is the ideal), should have different formats if wanted. The East can do 1-8, because they're all in the same time zone so it doesn't matter they do, and then let the Western teams vote on what they want before the year starts. If they want 1-8, strict top 4 per division, wild card, it's up to them. Because Western teams are the only teams, before the Final, that have to care in any way about travel and time.