Donb, you are one of those old-timers that uses oil on all the trim, eh? I have heard of guys like you, LOL. I still paint oil on trim if people want oil paint. Benny Moore's Satin Impervo seems to be the most requested, although I would think if you wanted oil, you want it because of the high sheen. Anyways, oil is so dang sloppy and drippy - I can't believe you old timers had the wherewithal to be able to cut in neatly after the walls are all nice. Cutting in trim first in my opinion started from the frustration of painting oil on trim. If you paint oil on trim first, after it dries - all you have to worry about is neatly painting in latex on the walls, which is no big deal.
And now the technique remains even if you use latex on trim.
-PlainPainter
P.S. Do you use 100% acrylics on the trim at least?
P.S.S I couldn't stand how much oil paints yellow, did this bother other people as well?