We are in the time of year when I will attempt to control temperature using the lid vent. It does work, a bit, but isn't ideal, at least for me. If you start closing the lid vent down, the air flow changes and the temp and smoke get less predictable.
I blame this on the precession of the equinoxes. Or axial tilt. Or Daylight Savings Time. Trying to deny me the midweek cooking on charcoal experience.
Or: "It's dark and I can't see what I'm doing so I'll just close the lid vent down."