This is an MMORPG that is build around progression, in content and gear. This is not a kids game at school where everyone gets a participation token. You would not vote for every player getting 20.000 cash out of the bank every round in Monopoly, do you? Games come with rules, and staying inside a given ruleset is the heart of and the reason why we even play games.
The curve has been lessen a lot over time for new players to faster catch up with friends, guild, whatever (mostly because more and more veterans did not play the lower content anymore, so there was nobody to play with and learn from for new players). This brought good effects (->new or returning players had much more options what they want to play, veterans can bring alts to a needed gear/aa level very fast), but it brought bad effects, too (-> content being neglected, faster gearing than learning).
The raidfinder pushed the border for free loot (read: beeing afk) from T1/2/3ish (World Bosses) to T4 (which is still the best gear ingame besides T6, which is superior and the reward for beating the hardest content, hence only owned by very few harcore raiders). This is of course something all players should and do care about and have an opinion about, because guess what: We all have to and want to play with our “neighbours”. In a game that is literally all about progression it is a huge problem if this progression is just cut of, with a shortcut to the second best option. I am not coming of a place of envy or bitterness, as @byrnensorg thinks, because guess what: All this issues decrease my own playing experience, too. I like this game, I care about it, so it is only natural that I am very interested in a discussion about its problems.
And of course it is a huge problem, too, in a game focused so much on socializing, if you can not jugde the players experience by his or her gear. And another problem is that a lot of people, mainly new players, mix up the difference between owning gear vs. skill/experience. Next problem is that the raidfinder is a place without any concept to deal with any of its problems. A vote/kick option works in other games, why not here? Like, 75% of the raid have to vote yes to kick a player? How do you define abuse? (This is a crucial question.)
Not so simple: Leechers and trolls destroy the gaming experience of other people, why are you ok with a concept that punishes the people who suffer from them (30 minutes cowards buff) instead of putting a system in place that punishes trolls and leechers?