I don’t have a way to respond to that without sounding a little more negative than I want to be. It boils down to be making the worst kind of argument, “The novelty will wear off so it doesn’t matter”. I don’t wholeheartedly believe in that.
I’ve always wanted a commons-only mode, or maybe a monthly rotation of 100 troops, etc. Limitations breed creativity, but the novelty always wears off. So there needs to be a lot of churn in the choices.
But there also have to be choices. When your event criteria excludes all but 8 troops, there’s not much of a teambuilding challenge there.