Dogzilla, a y front only applies to briefs. The slit in the front is cleverly designed as a series of overlapping panels - kind of like those rat mazes that researchers use. It was clearly designed by someone without external genitalia, since it’s impossible to use and therefore serves no practical purpose.
I’d never heard of the “through the leg hole method”, so when I’m wearing briefs it’s OTT. This is really a bitch because if I go out through the fly there’s a compression factor that makes it somewhat painful, and if I undo my pants they have a tendency to want to fall down around my knees, recreating the young-at-heart look.
This is one of the reasons I usually wear boxers, which are a breeze to navigate. Boxers have what amounts to a front seam (fly) that hasn’t been sealed. Zipper down and straight on through the front. Why is there even a debate? 