What if you consider the 'platform' google? They've not 'sacrificed', they kept it consistent. No?
Having said that, and speaking as an Android user/developer, I am always annoyed when an Android app I am using is very clearly an iOS port and still retains the iOS look & feel. This annoyance isn't coming from added cognitive burden or a fanboy-type perspective but probably from a design perfectionist/hipster perspective.
It just seems.... rude, I guess, to not follow the local cultural norms (though I do get why it is done for expediency).
They also blown up the huge thumbnails for videos, so you can basically see 2 and half videos on the screen, compared to a much denser list before.
Not to mention the information density on the tablet : http://a3.mzstatic.com/us/r30/Purple69/v4/37/3f/0d/373f0d5d-...
Material design can be pretty nice, but not with horrible wasting of space where Google went completely overboard. This is BAD.
That said, I'm a big fan of adopting the best design paradigm for the platform. If I was building an Android app, material design would be the go to. Why? Well, Android users have already used it. The cognitive burden to how things feel and work has been removed, letting your users feel familiar with the app from the get go.
Similarly, with iOS, closely following their human interface guidelines will produce the best results for allowing iOS users to immediately feel at home in your app. This sentiment is mimicked in the WWDC2014 video Designing Intuitive User Experiences.
For this reason, I'd personally tend to shy away from trying to port design principles to other platforms. It sure looks nice, but is it worth it?