I've taken apart MacBooks (it was cheaper to put in a custom SSD than buy Apple's overpriced one .. and at the time they didn't offer 16GB of ram so I manually changed out the 8GB chips) and I'm often on the road a lot in a nomadic fashion, so ship-in based warranties are often a not-an-option.
I've found Dells, Lenovos and even MSIs aren't too bad to take apart; even their incredibly thin version too. Most have replaceable parts (Carbon X1 has soldered on ram .. grr, but you could get an adapter to M.2 for the first gen weird/custom SSD).
You can make super thin laptops that are serviceable, and with high end developer laptops running upwards of a grand, yes, people do service them. At most shops I worked at, if your Dell went bad, the desktop support team would take it apart get a replacement screen, bezel, battery, whatever, and send the original back as part of their service contract.