I guess time of arrival really matters. My flight from Bangkok to NRT arrived an hour ahead of schedule around 14:30 today. I was out of the airport in about 45 minutes. There was lots of staff in the corridors leading from the plane to immigration including a check to make sure you had the qr codes all lined up. Lots of tensa barrier all over the place but thankfully just a very short line in the immigration area. Only about half of the desks were open at that time. Maybe being a Sunday also mattered