While I was shopping for a new laptop, I wanted to know which SSDs Dell includes in their XPS 15" models. So I called sales support. It turns out they don't know, and as of 2019, you lose warranty if you change any part. They should stop calling it CRU then! I don't know whether or not there is a seal or how they make sure you didn't tamper with the machine, or if this policy is even enforced.
So going with the included, unspecified disk was the only safe option. In my case it turned out to be a Micron 2200S NVMe disk, which is likely the same as the 2200. According to AnandTech the warranty endurance is 300 TB written, which is OK for a 1TB disk. A Samsung 970 Evo Plus has 600, my old Intel 600p has 200 TB.
It took me a while to figure out which laptop to get. In short, for me, Dell's XPS 15" cost 700€ less than the Lenovo X1 Extreme or P1 and Dell offers US international keyboards. Lenovo offers only European layouts in Germany. And you can't change them yourself in these two models.
In hindsight I'm not sure about my choice, anymore. The 4K screen is badly supported in KDE/Kubuntu. Everything is off, dialog sizes are weird, all icon sizes are weird, margins and icon placement in buttons is off. The mouse cursor switches between normal-size and half-size depending on the window you are hovering over. And if you attach an external monitor, KDE's settings offer only one global scaling factor for all screens. I.e. everything is huge if you set it 2x for the 4K internal display. The keyboard is way worse than Lenovo's and is missing the Home, End, Page-Up and Page-Down keys that I heavily use(d).
Maybe going with the Lenovo X1 Extreme or P1 with a more affordable 1080p screen and the English (EU) layout would have worked out better.