I really can't comment about anything besides my own experience. When I was working with a jazz/fusion group, a few year's back, I really wanted an upright. Sometimes, I just couldn't get the feel I really wanted with EB. But, it just wasn't sensible.
DBs are expensive. I toyed with idea for some time, but ultimately, just the thought of lugging it around put me off. I didn't even know where it would live in my house let alone how I would get it to gigs. I also considered electric upright options, but never pulled the trigger. If I ever get into that kind of project again, I probably will go that route.
But, I got by just fine with fretted EB.
I've seen plenty of videos where the bassists use both during the same show, so I don't think there is any "rule" regarding which is "correct".