I saw a post by Brian James a while back about starting with enthusiasm 10 and trying to maintain it (only using CT when required) which to me seemed much more logical.
I'm open to suggestions on that. It seems like in a three-game series, there's enough room for enough possibilities that having both options adds a more interesting gameplay element.
In more competitive leagues, however, there are real options which include real trade-offs. Such as league position for enthusiasm, for example.