I used to want plugins just because of LastPass. But now that LastPass can log me into any app and any site anyway, I don't have a need for a native plugin anymore.
Agreed - works great for my phone. Still need extensions to get LastPass working on an Apple product...
I really want AdBlock, I can get this for Firefox Mobile so can't see why Chrome won't allow it?
I suspect you've answered your own question. Companies like Google, Facebook, and Apple are still trying to figure out mobile advertising, and making it easy to install Adblock on you phone would be pretty disastrous to them.
Of course, I think adblock doesn't block Google Adwords by default, so maybe Google wouldn't mind!
Firefox for Mobile already does it.