As it says on the cover; the AI is supernaturally good at taking down helicopters, and it really just makes coop worse as an experience.
So while earlier it may have been a rare and unfortunate occurrence, now it's practically a guarantee that one or even both helicopters will be lost without doing much on anything against the bots.
This creates a situation where it really feels like there's no point to using these supports, since they keep getting taken out without doing much on anything, and it really is a gamble whether they'll be able to do anything before inevitably being destroyed.
What this means is that the support becomes much worse and instead of being a powerful one time use support, becomes a throwaway gamble with the vague hope that that it might be able to take down some enemies.