Because as soon as the indie audience catches wind that a game uses AI for any code, artwork, or writing, there goes the "indie" cred. It's not cool anymore. Worst case, some ludds launch a vocal public crusade against you.
Rest assured, there is plenty of AI being used, but the game devs know better than to talk about it.
Rest assured, there is plenty of AI being used, but the game devs know better than to talk about it.