I recall that the letters on the keys of my Thinkpad got worn off overtime. How about those on the Lenovo Carbon X1 6th gen 2018 and the DELL XPS 13" 2018?
one of my friends bought Lenovo Carbon X1 and I am feeling sad to say that the keys of his laptop were also worn off over time. So you can't be sure about the keys and moreover, it depends on handling too.