Receptionist may or may not be strictly necessary for any particular building, of course, but it's indisputable that a building receptionist is a real job. Eg a large office or residential building where you have a large number of people coming and going throughout the day. Part security guard, part front office mail clerk, part janitor, part concierge. More than enough random little tasks that are difficult enough to automate in the edge cases.

The article also mentions "Sanitation technicians", which are about as far from a bullshit job as you can get... someone has to clean the shit.