Several efforts to increase overtaking over the years came to nought, including drastic changes in the size of front and rear wings etc. Then they introduced KERS which helped a little but not a lot, and immediately dropped it at the end of its introductory season. A crazy decision in my view that set F1 back an extra year.
Frustration must have set in and they decided on a whole host of changes all at once which has cheapened the show to some extent, at least for the purists who write articles like this. And some are even more openly critical.
But the bottom line is that the changes we've seen for this year have met with huge approval from F1's most important audience: tha average fan.