There's wasn't a whole lot Mercedes could have done to make W06 that much better as it was already a phenomenal car. There are some good updates to the sidepods and I'm certain a lot more we're not seeing, but otherwise W07 is as expected. The larger engine intake may be for their now allegedly 900bhp monster which with a smaller intake they just couldn't feed nor keep cool. The benefit of additional power must outweigh the lost cfm around a smaller intake.
Thus far Ferrari seemingly have the most innovative car with their raised gearbox solution. We may see MB turn their engine up to full whack more often to keep them behind as I believe much of the past 2 seasons they haven't had to.
If there were any complaints about W06 I would say it would be that whenever I saw Nico onboard he seemed to always have a bit of understeer....