I'm glad I was not in a PAL region lol.I mean, initially? Only 5, 6, and 10 weren't released in the US during the same release window as the originals, all the rest were available in the US pretty much the same release window as the JP ones (accounting for the usual year-ish delay for translation, of course).
It's not like the DQ games never showed up in the US after the first few games, they just weren't as popular as FF.
The PAL regions, on the other hand, didn't get shit for the main Dragon Quest series until 8, was only after that released (a couple years after it's JP release, too) that PAL regions was actually considered a viable market for the games for some reason.
They eventually brought 5 and 6 to the US? What system? I would be interested in that. I'm a bit of a completionist when it comes to game series. I played DW 4 but didn't play any after that because 5 & 6 weren't available in the old days.