I can't really see the point. At all. Having the same amount of numbers is no guarantee you will have an equal strength. In fact, a clan with more numbers could be equal to a clan with bigger overall players and by limiting the sizes you limited the overall number of options for this. Then there is the fact limiting people within clans can cause more movement and less clan loyalty which goes against one the the devs stated aims for EE. There are plenty of options the devs could look into to make wars fairer. A handicap system, merging of clans to equal out numbers and sizes, or whatever. There have been plenty of ideas put forward by players on this subject should the devs want to look into something new. This was always going to be the problem with having a war system based purely on actions and therefore power.
Rules is Every After 1 hours the loser side can add 10 percent of clans current active members but losing 10 percent of their current plunder For ex : losing clan has 42 members, after 1 hours, plunder score is 13b vs 29b, so this clan can add max 4 members into war, but losing 1.3b of their plunder.