Mozilla can spend money on this, but not Thunderbird or XUL-based extensions?
It seems we have have been taken to a bizzaro parallel earth where people enjoy built it bloat that should be an addon in their formerly highly customizeable browser.
I think it's a failure of imagination to assume that this is going to be the extent of what Pocket will be able to contribute... they have a lot of users and popular mobile apps for instance which is useful on its own.
As the blog post points out, the hope is that Pocket will accelerate the context graph initiative.
So, I disagree that it's about "bloat" or customization. In any case, the Pocket add-on is like ~700k and it doesn't do anything if you take it off the toolbar...