After I read what I posted I realized that it looked like I was complaining about the current way....I'm not.....sometimes I benefit...sometimes I don't...that's fine...I have just seen several posts about people being upset about it.
I also realized that what I posted had some obvious flaws....
If you add troops to a already existing army the "experience" would start over....this should prevent people from keeping 100 person armies at their home base..then when they get "experienced" add 20k and go kill everyone.
Also, the advantage that an experience army shouldn't be THAT much.
0-7 days = no experience...no advantage
7-14 days = some experience...3% advantage
14-21 days = more experience...5% advantage
I dunno...again..I'm just babbling