Ceiling moldings/corner moldings in Attefall house?

[Slottsfrun]

Fairly newly built attefall house. Horizontal wall paneling, wood paneling also on the ceiling. Baseboards at wooden floors. Heating via air heat pump.

The carpenter chose to skip ceiling moldings.
Now I see that there are some irregular gaps where the horizontal wall paneling meets the ceiling paneling. And in the corners of the walls.

Behind the wall/ceiling paneling, there should be a vapor barrier. How well the carpenter installed this, I leave unsaid.

Now to my question:

Should ceiling moldings and some form of corner molding also be applied in the corners of the walls? To seal the gaps that are there?

I'm thinking mainly about whether moist indoor air would otherwise more easily "creep in" and could create moisture/mold inside the walls/ceiling?
Let's say the carpenter was careless with the installation of the vapor barrier behind the wall/ceiling paneling or that there are holes in it.

Or can I leave it as it is? If I can stand it aesthetically.

The attefall house was built about three years ago.

Example picture of a corner attached.
Poor quality, but you can at least get an idea of how it looks.

Appreciate your opinions!

 

[Testarn]

The air passes through gaps in panels and moldings, so from a moisture perspective, there is no difference if you install moldings. It's primarily for direct drafts that it might make a little difference, and other than that, it's about appearance.

 

[Slottsfrun]

The air passes through gaps in the panel and trim, so from a moisture perspective, there is no difference if you put trim. It can make a little difference for straight drafts, and then it's appearance for the rest.

Thank you so much for your reply! Appreciated! 😊