Actually I like NEXON's stance on this.
Basically the matchmaking algorithm is completely unknown to us. We know some glimpses about an offensive and defensive point totals, but it seems the algorithm is not a fixed one, and probably it is constantly tweaked. We had horrendous matches in the past, but it is not happening anymore recently. We didn't ever had a stacking alliance opponent, like it is described by many of you.
We are fielding GA to high EA members for war, we have rarely met an alliance with a Gunpowder Age member.
I believe, Nexon should just make sure that the complaints about stackers meeting a flat balanced level alliances will not happen by a simple tweak and the should stay silent, as they did in the past when touching the matchmaking.
So back to You Tower: fielding a Classical Age member for a war together with Global members is a bit, hm, not really honest. Of course I do not know a reason and so, but maybe NEXON allows just one Age tolerance for the lowest level member and while you have Classical Age member that allows you to be matched against an alliance fielding Iron Age members.
As said above. We were never matched against an alliance with lower than Gunpowder Age member when we had the lowest level member in EA... Give it a try in the next war and field GA to EA members.