They are just two examples of things we need. Did you expect an extensive list of all the things someone needs to do? What is the point of your comment?

Sure, you can employ everyone and they’ll still be useful. Trash on the streets? That’s a job. Pothole in the road, that’s another job.

I just commented that the basic necessities of life (food, water, electricity, etc…) can be covered with very few people.

Who supplies the wires? The copper to the wire maker? The plastic for insulation? Transporting it? Building the road/tracks? Etc etc.

Of course there are bullshit jobs out there, but I think we are under estimating

I don't think we are underestimating.

When you hit scale like that with specialization, it's conceivable a relatively small amount of jobs can provide a society with the base necessities.

These are few examples and I am expecting the reader would use their imagination a bit.

Food production - planting seeds, collecting crops, watering the farms, creating anti-pesticides, creating all the farming equipment, packaging food, distributing food, storing food (for storing food just think about all the work that goes into creating a fridge - from mining metals from the ground, to designing the fridge and building a factory that create thousands of fridges quickly)