I feel your pain. Asking for ideas I don't mind so much, especially the last few years where money has been quite tight and it's a great way to help ensure the Dc get quite a bit that is ON their lists.
But where it drives me mad is the endless to and fro:
"oh no, I don't want to get her skincare products because I don't think it's appropriate" or "okay, but the one you sent a link to is sold out so now I've got 5 other ones that are similar and you must tel me which is the best one."
Or the endless questions on size if buying clothes:
Me: DS needs at least a large or XL in the NIke sizing.
MIL: But it says that's for children 13-15 and DS is only 11
Me; Yes, but he's tall for his age and big and he doesn't like them tight.
MIL goes to shop, buys size Medium. I have to return it.
Or my personal favourite - I send the list to SIL. She tells me she will buy XX. Brilliant, I don't have to worry about buying XX, SIL has a gift she's happy with, win win.... or so I think. The number of times I've then got hysterical messages from her on 23 December becuase they're sold out/won't deliver on time/she can't now find it at the last minute. And somehow, it's ALWAYS MY fault.
My dad isn't great at the whole gift thing and he lives far away so his approach is he sends me money, I buy gifts from him, and everyone is happy. It's not ideal but at least I'm not having to bloody negotiate every step of the way, And the DC are old enough now they'll say things like, "Is that something we can make from Grandpa this year?" or "Can I just get the money from Grandpa to put towards my new computer" or whatever.