OS is all based on the same thing. yes. Vanilla Android by Google. (the same Android being used by the devs of Cyanogenmod via the AOSP project). The updates for the base OS is out there. Then devs have to integrate their customization (such as Sense in HTC phones, Touchwiz on Samsung, etc etc), carrier specific programs, security features, and other modifications, and they have to make it run on each specifit device. At its heart- the OS on my Viewsonic G-tab is the same as the one on my Thunderbolt. HOWEVER, the entire surface of those OS's had to be restructured to meet the specifications and functions of each device. Its not a fast process, especially for companies with many devices, and reputations and warrantys to stand behind (bad/buggy OS release could mean bricked devices, warranty exchanges, bad PR, etc etc... all of which hurt their profits, which is, after all, why they're in business to begin with).
And netflix DOES run on thunderbolt. I was watching it tonight at work. You DO however have to root it and install a gingerbread based rom on it. I'm using gingeritis 1.0, and when rooted and updated properly, the risks of bricking are almost absent, and the benefits are well worth it.
bottom line- if you dont like the features available on the OS on your phone you have several options; go buy another device, root it and install a rom with the features you do like, learn to be a dev and make your OWN rom, or just quit QQing about wanting the super super latest thats only available on a few devices. It'll come to yours, eventually, if its capable or running whatever it is you want. You opted to own a device thats on the leading edge of consumer technology, having to wait for releases is an unwritten part of the contract you signed the day you decided to buy a premium device.