Just 2 ideas i had, taking into account the m+ playerbase who doesnt mythic raid (that includes me, and my disconfort with the situation, so read this having in mind that im not you)
1- Make it simply a cost matter, if didnt kill the boss the mythic raid item is still acessible, but will cost twice (this implies timegating, time to farm the boss and more stuff, but doesnt lock out people)
AND (not or)
2- make M+ mythic level gear purchasable, probably something similar, got 3k rating cost half then if not…
I know some people worked harder for stuff and would like to have more benefits, i dont see why not… but making a community that you are part of grief over something rarely ends up with something positive…
Just my 20 bilion cents (im not cheap), trying to see a middle ground towards comunity grief
Have fun.