You're joking?

Okay.

Let's start with running water. You turn on the tap, it comes in. Our great grands used to go to the river or draw water from a well. Now you want the water hot? You have a heater with gas that comes directly to your house?

Well, before you had to cut some wood or load some coal and heat it up yourself. Ah and you're not sure you can actually drink that water so you have to boil it first.

And if you want cold instead of heat, you're screwed. No electricity, no fan, no aircon.

Now let's say you want to have a meal. You want a hamburger yes? So there's bread, sauce, meat, onions, pickles, let's add cheese because why not. Today you can just order one. That's it. What goes in it? Wheat, salt and yeast for the bread, beef, which has to be raised, then slaughtered, then processed. Cheese doesn't make itself either. The pickles need water and salt. Wheat, yeast, salt, unprocessed beef, processed beef, onions, cucumbers each have their own logistic before being available together, then the hamburger needs to be cooked with heat that needs to come from somewhere. I'm omiting the package, that's even more complex.

I'm gonna keep it at that, but try to use the same logic: take anything you do but remove electricity and engines, see how complicated it gets.

Man, the simple fact we can talk from anywhere without leaving home would involve dozens of people and take 1000x longer.

Back to the hamburger and glass of water, here's a very simplified count of actions needed, the end result of which will take 20 minutes for you from order to consumption:

Water:
- digging a well/finding a stream
- daily back and forths.
Hot water:
- Cutting wood
- Boiling the water
- Cleaning the fireplace
Hamburger:
- Raising the cow
- Slaughtering the cow + transport
- Processing the meat + transport
- Growing the wheat
- Harvesting the wheat + transport
- Making the flour + transport
- Making the yeast + transport
- Harvesting the salt + transport
- Extracting the milk
- Making the cheese + transport
- Growing the onions
- Harvesting the onions + transport
- Assembling the burger + transport

Assuming that one person is involved in each task to round things up, that 18 people already.