Yes-ish However the differences are not as big as you think. While this might be true for the luxury brands the “common” brands do share parts, often quite crucial ones too. (Think headlamps, think servos) Also they started to borrow design aspects from each other. They are not identical but certain lines do look very similar on a quick glance
That sucks so much. I have such a cool vein scanner built in to unlock my laptop jedi style and I can’t use it because Fujitsu decided to not add support for Linux 🙄