Who says to "remove" it?
Super-boosting the computer opponents in Warlords (and I mean "super," as there was also boosting in Trials, but not as fast) sometimes leads to unfortunate situations, for example, when there's only one path from the spawn point, and right after the exit, the computer opponent's respawn point begins, and you can't pass by without triggering it. You enter, and on turn 112, you're killed in the field without any chance of escape by a combined army with 3-4 stars. Yes, this doesn't happen often; in most cases, issues with the computer opponent are resolved more or less normally, but encountering such a situation in a tournament is not a pleasant experience. That's why I'm in favor of reverting the computer opponents' experience to the Trials level.