Hi bayrock
First, there are Defensive allies, but coordination of attacks isn't allowed on Express.
Second, the attack formula with allies can be found in various places, and here's a good one:
https://www.earthempires.com/...rmulas-47112?t=1566672204
Third, the game is periodically worked on by the developers, but most of us are pretty happy with the way things are working and content with occasional bursts of improvements. I've been playing for 12 years, and its a pleasant pastime for me building countries, sometimes warring, sometimes netting. Lots of old friends stop in and play a few rounds from time to time and there have been a lot of returning oldtimers recently.
The game is old and has a nostalgic charm. There's always something new to learn, the math is fun, and the market is sort of unique. Some people want the latest game and lots of video and explosions, but Earth Empires has plenty of excitement and risk, its just more of a mental game than a visual game.
If you want the wild west with no rules, try Team.
Anyway, good luck!