Because it'd require more work.
I do think that'd be better, though. For the LAN mod we kept tweaking civics until we started using more of them. Though I don't think we ever touch the Compassion line - didn't care

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None of ya ever run expansive leaders do ya XD...
Public healers FTW. Heck, even as organised its quite affordible for the global boost it gives ya...
Note: I have used it in ONE game I didnt have organised or expansive in... I had erm... gotten my gold economy a little rediculous... (6 great merchants in one city, bazarr... some great preists...)
And well, if your Ashen Veil, of COURSE we know what youve chosen in compassion...
I barely notice the difference between Sac-the-weak and Basic care, and well. Protect the meek isnt worth the upkeep.
Now as for the threads subject of education, and city states being the real focus off it...
I use it 90% of the time. The other 10%, is god king. And I do know someone who uses aristo rather often. Although he tends to fall a little behind doing so. Oh, and late game as cardith I did once use republic to alot of good purpouse. But really, city states and to a lesser extent god king seem like the utter best of their civic catigory.... Which shouldnt be right. As theyre the first.
I mean, in other catigories... say culturual values.... theres one that I find usless... Utterly. But well. Ugh, pacifism. but all 7 others are VERY usefull in some intance or another that comes up now and again.
In labor? Nothing useless there, well, other than starting, but that ones ment to be blank.
Economy? Holy cow, the hard choices...although Merc is certianly the least usefull. While definately still of use.
Okay, you already know my critisims of compassion. Would be nice to get some rounding out here... this catigory is sparce and flavorless... basicaly reading "Ashen veil" "Whatever" "whatever" "whatever" "Expansive/organised loves"...
Membership is membership. XD Unless were starting a neutral council of neutralness, where we vote on what to be neutral about... It doesnt need to be talked about.
Education is always high in my to-do list. Usually just after either RoK, or Markets. This does strike me as a little much. Then again, I'm an expansion whore. The obvous exception being playing cardith lorda. Who, well, XD... Early game shoudnt even THINK of city states. In contrast, he still needs edu, as cottage economy is his FRIEND.
So is edu too strong? Maybe a little. City states could certainly use some tweaking. Although I have to say, I would like some other-more minor methods of reducing my city upkeep. Perhaps under economy/compassion. Economy because it makes some sense.. and compassion because its a bit... sparce.
Well, theres my 42 cents.