The AI features that stick around are always the boring ones. Autocomplete that learned your codebase. Error messages with a fix attached. Search that gets what you meant. Nobody talks about those in demos, but nobody removes them either.
The flashy stuff gets quietly deleted. Usually because someone pushed to ship it before anyone could explain what problem it was solving. I've seen this a few times — the feature works technically, users just never touch it.
Honestly the question is the same as it's always been in product: what's the one thing people wish they didn't have to do?