I don't know what "lazy" has to do with it. It's just as easy to install the screws either way. I can see calling the use of nails "lazy", maybe.
I just removed an entire roof I installed 10 years ago that was screwed in the flats. I found no evidence of leakage. This was to 5/8" plywood with a layer of "ice shield" underneath the steel, not raised purlins. Had to remove the roof to alter some of the rafter structure and re-installed. Good thing it was all screwed, otherwise I'd never been able to do it without damage.
I found that with the roofs I installed by screwing in the flats . . . often the seams wouldn't close completey until I added some screws in the high ridges anyway. I also like having screws on the high ridges when it comes to walking them with snow and ice on them. Easier to find and get a foot hold.
Regardless, all the major companies that make the roofing recommend screwing the flats. Nothing to do with "laziness", but maybe something to do with appearance? Seems when you screw in the flats, the screws aren't as visable from a distance.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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