Not everyone has root on their Linux box and even if you do, you ought to be able to install applications as you without sudo'ing anything. Right now most Linux applications guide you to a deb/rpm which runs as root (and who knows if you can trust it).

TBH this is just the start of making applications more secure, they ought to be sandboxed too, so one application can't read the data from another application by default (similar to how phones work).