I too enjoy having an extra layer of protection from the companies writing apps. (And the companies providing libraries to them, like Facebook.) And for my own

I too enjoy having an extra layer of protection from the companies writing apps. (And the companies providing libraries to them, like Facebook.) And for my own stuff, the sandboxing gives me a layer of protection from vulnerabilities in the libraries that I use. I think being able to side-load stuff, while keeping the sandboxing (and requiring user permission for access to data) in place would be ideal for me. This makes it a bit easier to write stuff for the device and distribute ad-hoc to friends and family stuff that is of no interest to the general public. I don't have a strong interest in alternative browsers, because I don't believe any of the developers of alternative browsers will prioritize battery life. But I know others have strong feelings about that.