Isn't that in purpose tho ? Like "hey if we're not sure to be able to break on time, just disengage so it's not our responsibility anymore"?

Same, that's why I don't understand how this is supposed to stay a two-pizza team system

But why ?

"Each team is full-stack and full-lifecycle: responsible for front-end, back-end, database, business analysis, feature prioritization, UX, testing, deployment, monitoring"

"But they also shouldn't be too large, ideally each one is a Two Pizza Team"

Either that's a team with some hugely diversified skills, or that's two car-sized pizzas