Sherry cask whiskey

Hi, I’m trying to understand why sherry cask whiskey is kosher. I’ve spoken to an orthodox caterer who basically said 1) Politics (there’s a kashrut org where I live that basically allows it at functions but will have a card that says that they don’t endorse drinking it) 2) it doesn’t really have the flavour of the sherry so it doesn’t matter.

But surely even if it doesn’t have the flavour, it doesn’t count as 1 in 60 as it was on purpose. Also surely it must have the flavour – why else would people care about using the cask in the first place? Also, if it loses the taste so that’s why it’s fine, surely the same would apply to wooden spoons for meat and milk?

I understand that most people say it’s fine, so I’ll drink it, but I really don’t understand why, so any ideas would be useful. Thanks