One of the reasons they don't paint (although it's getting better!) is because it's harder to hide the gaps between panel joints, etc.
Get used to it, I've owned rigs that were anywhere from $21,000 to well over $300,000. Lucky for me my expensive one was a 2006, back when Monaco made a top-notch product. One of my RVs was $155,000 new, and it was falling apart - literally - within 10 months (Thor). Every trip we took in that RV, something broke, sometimes multiple things.
My current Rockwood has held up quite well.
Do a search on YouTube for painting RV interiors and you'll see what I mean about how difficult it can be. We keep saying we are going to paint ours inside, but the level of effort it requires has us pushing it back to the back burner.
If you decide to reglue it, I can't recommend this adhesive enough.
https://www.amazon.com/Barge-All-Pur.../dp/B00B5XDPLC
Just a thin coat should solve your issue for a long time. I've used it for all sorts of regluing projects in all my RVs.