If you think they didn't put all hands on deck after the early access launch date reveal, you're high on copium.PoE2 has a different team tho, it doesn't impact PoE1 development.
When asked how big the poe1 team is exactly, they always counter with "well the people work interchangeably on poe1 one day and PoE2 another day". They never confirm a hard number. It could mean that there is a bunch of people working 100% on PoE2 and then there are some guys who work on PoE2 80% and poe1 20%.