Fairy Tail Episode 21: Phantom arc finally begins, after the opening had been foreshadowing it for some 10 episodes. Also Juvia looks completely different from her 2014 incarnation.
Yeah... from what I've noticed recently, quite a few series of anime end up having their openings foreshadow something, so I usually skip the intro just to be safe. It isn't much of a plot twist if you already know about it.
The whole point of foreshadowing is that it encourages active thinking and trying to puzzle out what it could be foreshadowing. Ignoring it defeats that purpose entirely
Well but the problem here is that, in early seasons, Fairy Tail would actually change openings in the middle of an arc. So like, you are watching an arc, but the opening already is about the next one.