there are many distros that give you detailed control over everything that's installed in the system.
Ubuntu is not aiming at people like you (and me) who want this control.
they are aiming at people who want a desktop that 'just works' and who don't care how or why it works. As a result they choose to install things that you and I don't want on the system.
now, if I care enough, I can still go in under the covers and rip things out (it's pretty much Debian under the covers, so if you try hard enough to ignore the defaults, you can do anything with it that you can do with Debian)
there is a place for Ubuntu, and there are places that Ubuntu should not be used.