How are they not? It bypasses older content in such a short period of time. If people want to see the content there is LFR, but to bypass actual progression by doing stuff that takes little effort is madness.
If it's critical for an alt to be at current raid level, the guild/group can probably carry at least one dead weight to get them where they need to be in a reasonable time frame. Right now it feels like the game forces players to do the current raid content as fast as possible, instead of build up to it.