This has happened before. Metas change.
It is not even unique to Empires. Game designers are human.
Click for math... Oops.
Hidden Math
But if you want actual math, you have to wait for @Garanwyn and @Kerridoc to return since they are are PvP number crunchers
Tile King
Tank King
Feature not a bug
Empires was a rush job, so many tool tips and game mechanic info displays were never coded.
Now it is a feature not a bug.
But this causes lots of headaches for forum discussion.
Having played games like BoH, and BT, that are transparent about mechanics. There is still problems discussing math. Because. Math.
Notes
FIN