Objectively analysing the Wimbledon Final...
I've read the standard "fixed" "family decision" as no surprise, however, there are a few key reasons for Serena's victory and some amazing questions to be asked of Venus.
People before the match based on Serena's SF performance predicted a trashing by Venus based on Safina/Venus. What they didn't take in mind is that Safina's movement really allows Venus to do what she wants to do way moreso than Dementieva especially Slamentieva playing at that level.
In truth, if you look at Venus' road to the final. Obviously a top seed is supposed to roll in the early rounds, but she really got opponents in which they really couldn't trouble her either by pace of shot/imposing their game(Radwanska) or had the pace of shot, but just can't match movement athleticism(Safina) she really got to do what she wanted to do in all her matches. Obviously, Serena moves better than any of her other 6 opponents, serves better, and hits harder.
Serena had to play Azarenka and Dementieva the latter being an especially good warm up to play Venus Williams. Dementieva hits a flat ball like Venus and moves almost as well. I fully believe Dementieva returns serve better than Venus as well. Venus presses too much on the first serves and struggles to read it more, but that's another discussion. Based on draw few could argue Serena had a tougher road to the final and played players closer to Venus than Venus played closer to her.
I never bought into the notion Serena was going to get thrashed even beyond that because when has Serena ever just played BADLY in a SF or F. Plus, Venus has never really played a PERFECT match start to finish much less against Serena.
Venus' tactics in the match were more an adaptation to Serena's play. She was not ALLOWED to come in because of Serena's weight and depth. Serena also used the angles of the court well particularly off the famous short angled FH to hit behind Venus.
This is the most important observation. If you notice at the beginning stages of the match Venus' second serve was upper 90s and looked better than I ever seen it. She also was 100% on her first serve winning percentage at one point and was getting them in often. As the match got to the business end her 2nd serve speed went back to its 70-80 range and I don't believe she got a SINGLE first serve in during the tiebreak. She also went for almost two complete service games in the 2nd set without landing a first serve. That's mental anyway you spin it.
Also, they were about even off the ground for a stage. Venus' depth on her FH and BH dropped and a couple of them were barely going over the net. She really got hesistant and tentative and when you play as flat and aggressive as Venus you can't get away with it in patches like Serena does. I mean her length really dropped and Serena stepped up and started to dictate.
This also happened to a lesser extent against Suarez-Navarro. When that R3 match got tight, her second serve went into the sixties at one point and she really pulled up and hesistated.
The mental advantage of Serena against Venus is paramount. It is not because of the sister and blood ties. Venus has never really been as strong as Serena mentally. If you notice the last years results or even this year Venus' losses have been mostly blowing leads. AO R2, Charleston, Rome(Safina), Her USO losses since forever. Anytime a player is consistently losing big matches by blowing leads that's mental/belief.