Pretty much my current playthrough of FO4 was going to be settlement-based. Modded to the bursting point. I had big plans.

But now I'm seeing that vendors of the same type share inventories and caps. This seems utterly insane. Why should I build a second town if it will have all the same goods, basically all loaded with the random junk I sold, and nothing else? I guess it just took me this long to get mad at fallout 4, and get with the times.
I posted on Nexus, but it looks like (surprisingly) no modders have tackled this huge, glaring problem.
I guess I should focus entirely on making one really good single settlement, but the Horizon mod sort of requires multiple strong successful settlements for them to be truly productive. Painted myself into a corner.