it does say "one
: can change the TIME (not the DATE) without
: damaging anything." So, it sounds like
: it is still advisable NOT to use the date
: change feature within +/- 3 hours of
: midnight.
Yeah, I was aware of that. But if you also read his explanation, the date change happens when the single tooth flips the date wheel (almost instantaneously). That means the tooth ENGAGE with the date wheel for a very short period of time. I think you can tell from your own experiences too. From my experience, ETA 2892s' date change is very quick, well within the time between 11:30pm~12:30am. I would guess this is the time that "tooth" actually engaged with the date wheel. I would also think as long as you don't change date around mid-night, there won't be any harm done.
Yeah, I agree with you changing date during late hours is not a recommended practice in general. IMHO, for watches with quickset date, the time restriction seems less compare with non-quickset date models. I owned a couple of watches that does not have quickset date as Cal.1120. It's almost impossible to change date during 9~3. I would guess if someone forces it, it will cause damage, and that's why there is this 3~9 rule regardless models.