Yeah, how often do you work in different places? Like you need a lot of other gear that is not portable, Roof / walls / window / desk / chair / paper / pens / books etc. Basically a nice office you are comfortable in and used to working in.
Desktops last pretty much forever. Almost every desktop component I've had worked perfectly until it was extremely obsolete and sold or given away.
What's crazy is that although their performance remains the same over years, their prices depreciate like crazy for no reason. I am never gonna buy new computers again. I've gotten a few 2nd hand gaming desktops recently on buy and sell websites for around €300 each (often including monitor / peripherals) and they perform perfectly, they can run AAA games fine even.
