I guess this is where we differ in opinion, i am totally of the mindset that, it is not unfair because 10 mans are not being deprived of anything, the option to grow a 25man component (even if you can't get everyone online for every set raid day) should be a goal, instead of sitting comfortably doing 10's while the players who have exerted that extra effort and time are stuck being rewarded the same simply because its somehow considered immoral that 25mans have a separate tier balanced around their separate raid size.
I don't know about 15 mans either, they already pissed off a lot of ppl when they practically cut guilds in half with the change to 25 man, this could be a stake in the heart sort of change. some ppl simply like doing larger raids, i know i will always miss 40s even if they usually were just clusterfks. the TS excitement was hilarity at its finest. so many ppl so much lols.