So, to cut through the gumpf- it can do it, it's safe and theoretically justified, and it is within operational procedures?
Mon Dieu! Il n'est pas un problem then? What are we talking about except trying to assure some hand wringers who don't know anything about it that
1-there is no problem with it
2-there are ten thousand different opinions, but from 747 pilots, there is broad agreement that there is no problem with it!
Excuse me, but despite agreeing, the 'feeling you get in your water' is totally irrelevant!