I don't know about "no-install"--I for one prefer the Chrome Web Store's model, because it gives users a definitive point (hitting install) where they can grant my app extra permissions for things like geolocation and increased local storage, rather than bothering them with fifty different prompts once the app is running (and giving them the chance to refuse, even though my app won't work without those things enabled.) Personally, I'd prefer if other browsers just adopted the CWS's .crx app format, and every browser allowed app installation from sources other than its "own" store.
That's not trivial for them. Adopting "crx" means they wouldn't have any say in the evoluion. The point of the web is for a browser to be able to take the lead with something like CRX and then work with the other browsers to standardise it.
Anyway, the permissions question is independent of the store mechanism. iOS apps ask for permissions on demand, Android apps don't.
My main point about no-install is simply that they're regular websites, not downloadable packaged apps. There's room for both, but right now there's no good mechanism to find regular websites with apps on them.
