One time had a CA brief me on the fly that he wanted to slow down and select this configuration. This was in the 330 on a (VERY) long final approach to PEK while level at intercept altitude (been a while, don't remember what the altitudes / meters whatever are over there but it was for the center runway, 36R IIRC). First I had heard of the technique so just asked "why?" and he said "want to slow down to stay below 210 but keep a lower deck angle". So asked "wouldn't flaps 2 work better?" to which he said "burns more fuel". So I asked "....wouldn't staying clean another like, 45 seconds be a lot easier? I mean your green dot is not too much more than 210 I really doubt they care?"
He slowed normally and wound up going with Flaps 2.
Wasn't trying to be a jerk or anything, just never heard anyone ask for that and truly did not get why he wanted to do that at that particular moment. Didn't realize it was "a thing"!