A doctorate is not about broad education, and the assumption of the author (all advisors, really) is that you want to get a PhD -- because if what you really want is an extended version of an undergraduate education, then the best advice is to put the PhD on hold, and go find yourself for a while. Otherwise, you're most definitely wasting something -- time, money, resources, etc. -- and a good advisor is going to redirect your mis-spent efforts as soon as they're aware. It's not about treating you like a "technician", so much as it's about trying to save you from a tremendously unpleasant experience.
"First, ask any tenured professor and they'll tell you they have the much less time for free thinking then they had in grad schools. Grant writing, committee siting, etc., soaks up most of their time. Second, the average age to get tenure is 39"
If you're unhappy about the life of a professor, then don't get a PhD. Sure, you can enter a PhD program, screw around for a few years to take some classes and gain "broad" knowledge -- but don't be surprised when you get kicked out. And then, don't be surprised when you have a multi-year gap on your resume with nothing to show for it but some bad recommendations.
I'm talking about having a broad education within your field, i.e. taking course not directly related to your thesis that can give you insight on your thesis or on something you might research afterwards.
>>"First, ask any tenured professor and they'll tell you they have the much less time for free thinking then they had in grad schools. Grant writing, committee siting, etc., soaks up most of their time. Second, the average age to get tenure is 39"
>If you're unhappy about the life of a professor, then don't get a PhD.
I'm not complaining about the life of a professor, I'm challenging the idea that you should wait until you're tenured to think new ideas.
On the other hand a PhD is not the place to study Arabic or Sociology if you want to be a high energy physics: you can do that, but in your free time, not in the University paid time. For a long time I thought it would be great to be a student all my life and just go to lectures and learn. But nowadays I know that if I want to learn I can pick up a book and learn. That's how a lot of people do: undergraduate is there to give you the tools but also to teach you the method.
Anyone worth their salt with a phd can study another topic by themselves: you don't need to be lectured and have tutorial anymore.