Bold statement that "invested more time" automatically equals "better".
I haven't played Threes yet but from the screen shot in that article, I think 2048 is at least a better-looking game.
I also have a hard time believing that there hasn't been a similar game before Threes. It's not like the gaming industry started yesterday. Such a simple game mechanic is likely to have been implemented before.
That's the problem with simple things. They can get invented more easily by anybody and often independently.