Months and months ago there was an enormous thread about increasing variety in Defend teams. Specifically in that thread there was a discussion related to associating the weekly event into some type of bonus if your home kingdom was set to it to encourage some variety (carrot) without forcing players. This was also to help change up the troop defend “meta” week to week by offering a limited time event bonus as well.
I’m certain I had a reply from Sirrian, but now it looks like its too old to locate.