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My un-official answer is “That’s the way it has always been”. The plan is to keep the oil in. If it’s full of oil the water can’t get in. Yeah, I know, it isn’t totally full, there is room for expansion. I really don’t think heat buildup is that much of an issue, but ????? On the other hand, what happens when you take the motor out of a hot car trunk and stick it in 50 degree water? Just thinking out loud.
Anyhoo,, the change to back-to-back seals on newer motors probably makes good engineering sense.
Meanwhile there was good sense behind the old owners’ manuals that said change the oil as part of a preventative maintenance schedule.
Personally, I think we are too concerned these days about a few drops of water in the oil. If it isn’t excessive, change the oil and get on with life. Just my opinions.