So to us it looks like: big lockdown, party all summer long, travel as much as possible, oh shit, lockdown again.
Yeah, but in fairness you're on the other side of the world so what it looks like to you is not the reality. As I said, a small fraction of the usual numbers travelled abroad so it certainly wasn't as 'much as possible'. As for partying all summer long, again that's simply not true. There were restrictions on all forms of hospitality throught the summer.
I should also add that plenty of Germans, Swedes, Dutch etc travelled during the summer. So it wasn't just Brits.
And now I read threads on MN with people planning holidays abroad during 2021. It’s just so odd to us.
Yeah, but what's odd to you doesn't really matter as your circumstances are very different. Surely you know that? And if you've read those threads on MN surely you'll also know that anyone who's booked holidays, and again it's a tiny % of the number who normally book in January, knows perfectly well that they may very well be cancelled? Your post is a bit patronising.