It's sort of like the buttons on some TV remotes.
Did you make any effort to check the facts?
Disclaimer: I have last year's XPS 15: although I am not a fan of Dell, I chose the XPS for fast i9 and good Linux support and I haven't been disappointed.
There's no need to be rude or condescending.
I'm going based on my experience of using Dell XPS13 and XPS15 laptops at work over several generations. I don't have access to those laptops anymore, so I can't tell you which models they were, but I'm not making this shit up.
To be clear, I'm talking about the plastic on the inside, around the keyboard rest/etc, not the external shell - from the images on the linked page, they still have that same look to them, so I don't know if they've stopped using it.
Ok: your original comment mentions 'lid' and 'metal case' without anything about the keyboard rest (which is carbon fibre). I am not saying I am the clearest communicator, but you didn't answer me very well IMHO.
Which XPS line are you referencing? I have last year's XPS 15: metal lid and metal frame.
"Color Choice: Silver machined aluminum", "Cut with precision from a single block of aluminum for a sturdy, durable chassis in a beautiful design", "The palm rest is made from carbon fiber". From: https://www.dell.com/en-au/work/shop/business-laptops-ultrab...