For me, it's a mix of the hard crunch and the soft crunch. Looking at other systems, they are either overly hard crunch (no room for real flavor alteration) or soft crunch (pretty much everything WW has ever produced).
Towards the end of 3.5's lifespan, the hard crunch became more and more template-focused, and easier to mimic for us homebrewers. We no longer had to write out this wall of text explaining a Decanter of Endless Water's activation time, we could just put it into the premade template. People will notice that my homebrew tends to be overly templated for ease of use.
In the mean time, the soft crunch no longer had numerical values scattered through it (god only knows how many +1 bonuses someone can dig up from just CW's text), making it easier for DMs to sift through everything.
This, in my opinion, was 4E's step in the right direction (even though they managed to screw up the templates).