It's not so much the logos or the branding, it's the build quality. I used to run Ubuntu on old ThinkPads, ditched it like an ugly girlfriend once I could afford a Macbook Pro. Old ThinkPads were a step up from commodity PC laptops, which were a step up from desktops. In a brief fit of FOSS zeal I bought a System76 Galago Pro, but the build quality was so inferior to a Macbook Pro that I relegated it to desktop duty. If I felt the need to move off of Apple hardware for whatever reason for my primary ride, it'd be back to a ThinkPad.
Rdl specified Dell or Lenovo also for the reason that the supply chain for those two ecosystems are well-developed enough that providing customer support won't be a huge hassle.