I remember back in my DOS days as a kid tinkering with autoexec.bat, himem and all that just to get an addition 10Kb or memory to run a game.
Now, with Windows in particular, they're slowly removing my ability to dick about and do what I want.
The defaults are all pretty much set to "we know best" and you have to jump through more and more hoops to disable stuff (Windows update, I'm looking at you!).
I'm moving to Linux (again) at the end of the month (got uni exams coming up... want to get them out the way). Had issues with it in the past but I will try and live with them this time as I want my freedom back.