I wouldn't have a problem with the combo. This game isn't competitive enough where having something unbalancing ruins the game. It's not like a buff to crypt fiends in Warcraft 3 where it affects tournament play. There is no big money tournament play for Civ 4. Or a buff to a major rifle or energy weapon in a FPS.
People complain about praetorians all the time, and yet it's only received one direct nerf. Not to mention players either self-nerf or self-buff anyways or play on a handicap due to various reasons. People even play Boudica with Rome just to feel the abuse.
I see no reason to not allow the combo. That being said, it definitely would be a strong combo, and Firaxis should give it to a leader on a weak civ and starting tech combo.
I pondered having a Spanish leader or Japanese leader with this combo. Spain's startings tech aren't good for early building, IMO, due to getting a religion first and fishing. Plus, the UU and UB doesn't really do anything with the traits.I could see it with a civ that has late game UU and UB. with like, fishing and roads as it's starting techs. I would really enjoy playing a super building civ. I'm not sure who would be a philosophical/industrious persona though? Any ideas?
I pondered having a Spanish leader or Japanese leader with this combo. Spain's startings tech aren't good for early building, IMO, due to getting a religion first and fishing. Plus, the UU and UB doesn't really do anything with the traits.
Japan's UB is certainly worthless for the most part. Samurai is fairly medicore IMO. It's got great looking traits, but crossbows still should hold it's own against it, so I don't mind. Fishing doesn't do much with the "banned" combo, and although the Wheel is solid, it also doesn't really contribute to the combo either.
Arabia might have a leader that built a lot, plus a few of their leaders were definitely enlightened to the point where Philosophical made sense. Mysticism and the Wheel doesn't really help. Madrassa could be a big problem since it allows 4 specialists from one early building. Camel archers are nothing special.
Basically, any of the starting techs that doesn't allow workers to do anything useful is probably safe to put with the combo. Certainly not Mining or Hunting, as that's like the best starting tech combo in the game, IMO.
It's simply too good. You could generate an insane number of great engineers, who complete wonders, who generate tons of other great people and the cycle continues. It's just too good and I'm glad it's not in the game.
You can do that with any PHI leader.