Okay, so after looking at lots of stuff on this subreddit and playing with pipes a decent amount, I now understand how pipes work, at least the basics.

However, at least to me, it makes absolutely no sense why they work that way. My main two questions are as follows, and are very closely related to each other.

1. Why on Massage-2(A-B)b does a vertical pipe without any head lift just … stop? All of the pipe sections below it as well as the extractor(s) are completely filled with water, the water extractor(s) are still on extracting water, which should force the rest of the water up. Instead, though, it just stops as if there is a solid wall(ceiling?) in the pipe at some point.

2. Why does a vertical pipe that has sufficient head lift still need to completely fill with water in order to flow to its end point? Shouldn’t that be the point of the pump, so that the water doesn’t need to be brute forced up?

It feels to me that pumps are simply required to make water act like it should without a pump, and that without a pump, water behaves very strangely, as if there is a solid blockage somewhere in the pipe.

What I’m looking for isn’t an explanation of how pipes work. Again, I know that in this game they need pressure. I’m asking why the [redacted] it works that way, when I real life, shouldn’t it work way simpler? Shouldn’t the water without a pump just be forced upwards? Shouldn’t the water with a pump be … you know … pumped upwards?