If the candidate uses a tool to "cheat", and then keeps using that tool while they work for me, is anything lost? Right now people "cheat" by using an IDE, but

If the candidate uses a tool to "cheat", and then keeps using that tool while they work for me, is anything lost? Right now people "cheat" by using an IDE, but no one has trouble with that (and rightly so!). So why should I care if someone is using LLMs to pass the interview and do their job if they are being successful?