Comment 4 for bug 713950

For reason 1, obviously we don't like to have one font contains all typefaces for all languages, so coverage is an important thing but not the reason for "it is suitable for being default".

For reason 2, this is a quick-and-dirty workaround which causes regression as discussed in Bug #659280, so working around that problem should not be a reason in this proposal.

For reason 3, #3 has said a good excuse.

For reason 4, if you say people still have the freedom to change back, then you have the freedom to change it to whatever you like now.