I have only made one set of armor by myself without any assistance and it was a ROTJ CFO, which uses the overlap method of putting the arms & legs together. This seemed like an easy way to go about it.
My ANH TK is ATA, which uses cover strips over the front & back seams between the two connected pieces. This seems to be the preferred way to construct ATA, at least in my squad.
I have some extra ATA legs sitting around that I decided to go ahead and put together as replacement parts. Looking at them, I thought "why can't these be overlapped too?" Its easy enough, right? Until now, I'd given little thought as to why strips are used. So, I put them together this way. In hindsight, I realize the overlap method makes them a bit smaller and I could not get a proper, neat-looking strip in the back of the thighs.
So, are cover strips more screen accurate, or used just because most people are a bit bigger these days than in the 70s and need the extra couple inches? Of all the build threads I've skimmed through, I was not able to determine the real reason, other than one's preference.