Do you complain in this way when you repeat watching a movie or TV show and don't get anything extra for doing it? Because that's essentially what NG+ is - watching the MSQ show a second time.

It's doing what players asked SE for - a way to replay through the MSQ without creating a new character. Others are enjoying it very much even if you don't.

If you find it boring and a waste of your time, don't do it. It's an optional part of the game you're not required to do.

If you want to get rewards for replaying the content, make a new character. That's what I do. I find that more interesting than blasting through NG+ with a max level job. I can always transfer any gil earned to my main if I want by listing a junk item on the MB with one of my main's retainers for the amount of gil on my new character (less the market tax).

Only thing I think SE should have given NG+ would have been the same XP rewards as the original quests for those who want to use it to help level alt jobs but it's really not a big deal when we already have so many other options for getting XP.