Now, sometimes it is possible to add features in a way that is unobtrusive enough that it doesn't affect usability for basic tasks. But it's a tough design challenge to do this, not a given.
By the way, I think Chrome overall does a pretty good job of design simplicity. But the "just ignore the features you don't want" argument is not a good basis for HI design.
It is a good basis if you can find out (as the HI designer) which features most people don't want: Then you can put them into places for advanced users, where they wait for the moment people need them. IMO the "simplicity" of many programs is just a crutch for HI designers unable to design a usable interface with more features.
Yes they do ignore the unwanted features, but they also ignore features they would use if they knew about them. In that respect the notion of bloatedness is even amplified because a larger portion of the software is provided but idle.