I will say that I like a little ease at the top of my sleeve caps. Perfectly matched sleeves usually don't fit right. But maybe that's because they weren't cut right -- I can't recall seeing a shirt with forward-shifted seams.
I have drafted my own patterns, and modified ones I have, to get results that otherwise weren't available. Couldn't find one for a swordsman's shirt, for instance, so I just made the long cuffs and stuck them on a basic pirate shirt. I learned that forearms are not as simple as they look -- the pattern has a lot of subtle curves. But I did get it to work.