I can only assume that you are trolling, since you are repeating yourself without giving any argument and praising someone that also didn't really give any argument.
I can do that too : the new edition is far better, no doubt about it !
Wow, we both created intelligence.
More seriously, how can you think that the old wonders are better balanced ? Those pesky double grey costs make some A-sides absolute trash. Some first stages can be built first turn in some setups, which makes no sense given what the wonders are about. Blue cards from ages 1 and 2 are way too weak, both in terms of their raw power and the chains. Red at 5+ players is way too fragile. Strategist's guild is completely overpowered, especially at 3p. And I'm sorry but the game is now very ugly (it wasn't in 2010, but graphics have made so much progress since then !).
All of these issues are completely gone in the new edition : costs rebalanced (with some mistakes, Hali-night too strong, Alex-night too weak, but less problems than in the original game imo), blue boosts, ludus introduced, decorators instead of strategist's, cleaner card/board design... If you care about game design more than about your nostalgia, I really don't see how old edition could be better in almost any way. It's still 7 wonders, so it's wonderful, and to this day still very playable. But as soon as I tried new edition, I just knew I found it better in every way.
About the expansions, have you tried Edifice ? You really should. You may even use it with old edition without any issue.