Before Covid shipping to the US was not much of an issue. But it's become both slow and very expensive since. Plus, insurance on >100€£$ fragile electronic items is much more important than, say, a 10€ record. And I even had to pause selling those (via discogs) to your continent starting last March. Personally, I don't mind filling out customs forms and everything but Covid has made international shipping quite more difficult. Three records I did ship to the US last November arrived in late February. Two of the buyers were incredibly patient but one opened a PayPal dispute and got his money back in January. I'm simply not too keen on going through this again.
Edit: as for the UK... since Brexit I had two items ordered from there stuck in customs for more than a month. Until this process works more smoothly, I won't ship anything there just because I don't want to deal with (understandably) desperate buyers on a regular basis. See above.