I have looked at that picture many times and don't see what you're referring to.
It’s a gap along the front edge, I didn’t photograph the entire front edge because I was trying to emphasize the width of it. It’s wider than either the top or bottom aluminum pieces and uneven.
I should have taken a video instead maybe. It’s “bouncy” and annoying. You can just sit there and squeeze it shut and let it re-open. It’s just a poor design and I believe done by Dell due to the absence of a recess for opening the lid. But the result is cheesy and cheap.
Which is a shame, because I otherwise love the computer, but I am not sure I would ever unsee it.
I have checked them out in 3 different shops and they all appear relatively the same
Edit: MacBook Pro by contrast, you literary can’t slip a piece of paper in between the display and base when it’s closed. I tried with a thin piece . I could probably fit several between the XPS display and base. No play that I can notice if you squeeze the lid and base together on the MBP either They seem to fit solidly together.
Lenevo was similar to the MBP in fit and finish, but again, only integrated graphics.
I am still looking
Edit 2: I actually preferred the build quality (and graphics card) in the Surface Book 2 over the XPS 15. That may be a contender for me.