Why does Gulf of Aden trade node not include in trade company region? It is very important node, if you want steering trade in Europe from Indus, Goa, Ceylon and Bengal nodes.
Another thing to consider is that it's a transcontinental node (part African, part Asian), whereas most of the trade company nodes are entirely African or entirely Asian (with the exception of Moluccas, which extends a little bit into Oceania). Given the continental restrictions on trade companies, it could get a bit confusing that e.g. an Asian country can create a trade company there, but only on the African side, and maybe that's not enough for a bonus merchant. (I think the continental restrictions on TCs are silly, but it's possibly a reason from the devs' perspective.)
I was trying to find the basis for this restriction in the game files and I couldn't do it. How do TCs have definite continents when several already span continents? Malacca, Moluccas, and Philippines have some African, Oceanian, and Oceanian provinces respectively. Maybe it's based on the first province defined?
Maybe you can create trade company in those African or Oceanian provinces if you have an Asian capital?