Remember back in 2006 when this film was first announced, and the word got out that this would be a prequel? Abrams and the writers were criticized for being too lazy to be able to think up an original story....
...fast forward to now, and this film has a totally original story, but now the writers are being criticized as being too lazy to have written a story that fit nicely into the pre-existing TOS world and used all the pre-existing TOS rules.
People are now saying that the alternate timeline is the lazy way out, and it would have been less lazy to write a story that conformed to the established TOS universe.
...fast forward to now, and this film has a totally original story, but now the writers are being criticized as being too lazy to have written a story that fit nicely into the pre-existing TOS world and used all the pre-existing TOS rules.
People are now saying that the alternate timeline is the lazy way out, and it would have been less lazy to write a story that conformed to the established TOS universe.