Cargodist isn't the same as what I'm describing. It creates destinations for cargo and passengers based on the existing network you have. In other words, "demand" is changed to fit your playstyle.
In regular Simutrans, passengers want to go to a specific destination regardless of whether your network allows them to go there. This means you have to change your playstyle to fit what passengers want to do, since otherwise, people won't take trips.
I believe Simutrans handles this better. If you're someone who wants to go to Europe but the only plane ticket you can buy is to South America, you won't take that trip (Simutrans model). But in OpenTTD, passenger demand is basically "yeah I just want to go somewhere" and then you deliver them to Antarctica. Cargodist means that if you now offer service to Greenland, they'll evenly distribute themselves between Antarctica and Greenland.
I'm more of a product-minded person so I prefer Simutrans. Demand is the constant I want to optimize around; I don't want demand to be optimized around my transport network. But this also creates a much more difficult game.
The linked article of the other person (about cargodist) says it distiguishes itself from an opentd extention called YACD which seems to be more what you are suggesting.
