>>>Why the necessity for this tyranny?
Suppose you want to collaborate on a report (or similar long document) with a subcontractor who doesn't have your fonts.
What do you do, lose all your formatting when you get the document back?
>>>One problem is that the MS core fonts are no longer freely downloadable.
I think they are, just not from Microsoft's site. As I recall, the EULA allowed redistribution, and this is still exploited legally by some individuals.
Oh, here ya go (thanks, google):
http://corefonts.sourceforge.net/
http://corefonts.sourceforge.net/faq8.htm