While playing your favorite element is cool, I think event balance is the most important thing here. If we have rules that would give us a better event balance, we should use those rules. One team being 12-0, and another 0-12 shouldn't happen in an balanced event.
i think its the vault-issue. at "normal" pvp, you cant exspect anything, but with war-rules, you know, against elements like for example life, chance is good they dont have any permanent-destruction, so - for example - a splash of phase shields and maybe a few quintessences is nearly an auto-win, if they dont have a way to go around shields.
the exspectations are very different here, while against aether nearly anyone is planning going around phase-shields and dealing with lightnings against, its pretty much useless for aether to use - at least - phase shields.
on the other side now fire, nearly everyone has to exspect deflagrations, so the average permanent-usage against it is much lower, and noone tries a phase-shield lock.
against earth, we saw enchant artefacts, but they know, opponents exspect artefacts, so they maybe dont use earthquakes, etc.
its not the rock-paper-scissor anymore, its more like a coinflip, in some cases with advantages on one side, cause they have more or better "non-auto-losses" against their decks, exspecially fast decks are that (time demonstrated that), but - and again - against life you can exspect a fast deck => hm...
...maybe more random, BUT at least you would see the elements strenght working (like phase shield-immortals of aether, or antimattered lockdown from entropy), if you would have to build decks for your team before you know your opponents, then there wouldnt be any purifys, etc., but you would have to build 6 good decks that still could suit to your element-strenght, and have to take some cards used in specific cases, like momentums if opponent uses phase shields (now some elements lost with their (one) phase-shield deck, and you know, youre not running in it), or deflagrations, and not cards like purify against death or holy lights against death-darkness, reflective shield against fire-air, etc.