Why these languages specifically? If it’s for different reasons you should pick what’s most important to you. Also, with Spanish and Portuguese, Italian and French should be much easier than the others but don’t you already understand a good part of them?
Ideally you shouldn’t completely trust the characters either way. But ok it might be easier for the movie to avoid issues when there’s little info. It gives more work to the viewer too.
We still know what we see. Many movies are equally vague about the actual mechanics and still introduce contradictions.
Tbf the characters don’t have to understand or explain anything. If there is a way for the internal logic of the movie to work without contradicting itself, that should be good enough for no plot holes.
Primer is one of those movies that needs like 3 rewatches to spot a plot hole and no one’s got time for that. Another good show of this type is Steins;Gate (totally watch it if you like time travel stuff)
So I had nothing to do tonight and went back and rewatched it.
Not sure if spoilers but just in case
There’s something more frustrating than the characters not knowing what they’re doing. In many parts we don’t get to see what happened. The whole movie seems to be from the perspective of one version of Aaron who wasn’t even there most of the time(?) And some parts that he did experience are glanced over so you can’t say for sure if there is a plot hole or not. The part where he finds himself going back twice in the same place is kinda weird but can probably be explained with the information we have.