I fly into Haneda whenever I can, because even though the train is super convenient, for a train, it’s nicer to just throw your bags in a taxi and head straight to your hotel after 13 hours on a plane.
[1] https://www.mtr.com.hk/en/customer/services/complom_checkin....
Right airline, right boarding time etc... It's not available for 100% of flights out of HKG.
I'm pretty close to that currently--although it's combined sick/personal/vacation. I've done a number of 3-week workcations in my current role and also had a few weeks of vacation banked from a prior paid time off scheme. I've long had a pretty generous amount of vacation time and I've always leveraged work travel (which I used to do a lot of) for sightseeing and related activities.
In developed countries outside the US annual multi-week vacations are routine for the middle classes