If it was expected to be a common use case, it would be included as a core feature. Furthermore, the number of people for whom "show[ing] up to give a presentation anywhere in the world" is a common use case is likely very small. I would go so far as to speculate that people in that category are greatly outnumbered by people across all demographics who use their laptops for sending emails, browsing the web, using productivity software, organizing media, and doing other software-centric tasks.
Cars do not come with child seats included as a core feature. Would you say that transporting under-10s is not a common use case of a family car?
> Furthermore, the number of people for whom "show[ing] up to give a presentation anywhere in the world" is a common use case is likely very small.
College students? It's always a big hassle finding a dongle whenever a MacBook user has to give a presentation in class.