if you cant accept criticism or trolling, you shouldn't be playing group oriented content. your reasoning is just a cop out. the REAL reason people dont want it is because all the special snowflakes cant handle being called out for being shit and wasting a groups time. secondly, combat logs have been a tremendous boon to world of warcraft. having the ability to analyze a fight, see where you whent wrong or how a wipe was caused etc. etc. and make corrections is exactly the opposite of "toxic". the term "toxic environment" is simply being used as a barrier to prevent bad play becoming effectively public knowledge, thus forcing the person to either actually learn how to play the game or get left behind.
P.S if you think that not performing at the relative level of the rest of your group and being called out for it is toxic. ive got news for you. dungeons and raids are a team effort. a chain is only as strong as its weakest link, which means everyone has to pull there own weight. if you think that its somehow okay to expect people to carry you when you are incapable or simply refuse to play at the level the rest of the group requires, YOUR THE TOXIC ONE.