I won't write much, just a small thing:
I don't really think its fair for any faction to be handicapped at any point of the game, that just makes for boring, "you must win at this point in the game or you lose" matches. All factions should have close to an equal chance at all stages in the game.
I completely disagree here. As long as there are differences between the factions, it will always mean that some factions are handicapped in different stages at the game - of course this should not mean that a faction has no chance to win at some point of the game, but it can be weaker.
As people are quite often comparing things to Bfme I or Bfme II:
In Bfme I Mordor and Isengard were horrible in the EG and bad in MG, but really strong in LG.
Rohan had big difficulties against an Isengard army in LG and the only chance to win a direct fight for Rohan were the spells (Army of the dead ftw
).
Rohan was a strong harass faction, they were never meant to have a strong army for a direct fight. Their target was to harass and therefore have a better economy than the enemy. (you can kill some of the small armies with your fast army and you can destroy all the economy buildings easily)
By doing this they can always have a bigger army (or at least more expensive). In a direct fight they could only win because of Theoden's lvl 4 ability (only 10% damage taken for all knights). But as soon as it gets into lategame they always have to play much smarter than other factions in direct fights to win.
It was the same in 3vs3/4vs4:
Rohan's goal was NOT to fight the enemy directly... As said Rohan is the harass faction. Rohan's goal was to kill single fleeing units and harass the enemy. By doing this the enemy had less troups and was overall weaker - even though Rohan couldn't fight them alone, their allies were able to build a stronger army and therefore win the fights.
So Rohan's work is not done in the big battles, but before it and while big battles somewhere else. That's where and when Rohan can help...
What does this mean for Edain?
I don't say that Rohan is perfectly balanced atm.^^ All I want to say is that imo it would be very boring if every faction would be equal in strength in direct battles. Not every faction should be played exactly equal (with equal I don't mean building the same units - but having the same strategy, just with different units). Of course Rohan should still be strong in LG, but they should not win a battle against Isengard/Mordor, if both player's just AA the enemy army, as Rohan's strength lies somewhere different.