Eurostar say leisure travel is back to 100% of pre-pandemic levels & business travel 80-85%. But due to Brexit they can only provide 70% of pre-pandemic capacity. They've plans to resolve this including trialling online check-in, I've added a summary at https://www.seat61.com/news.htm
The Man in Seat 61:  What's new on the site

News page on the Man in Seat 61 website

@seatsixtyone
So depressing. What's making them cap it at 70%? Simply can't process travellers fast enough at passport control?
@gpollara @seatsixtyone essentially yes.
Since brexit before EITAS every single person now needs to be asked all the normal 3rd country. questions you get at immigration, business or pleasure. How long are you staying, where are you staying, how are you financially supporting this stay and so on.
Before the passport is stamped and handed back, what used to take 5 seconds can now take 30s or more

@Dasy2k1
Thank you for clarifying, all makes sense.

I know it's a debate that no one wants to reopen but reading what you wrote, it still all seems ludicrous that anyone would celebrate such a regression in travel flexibility / ease in 2023. 🤷‍♂️
@seatsixtyone