Steward increase development is it worth it with tribal when you own feudal counties?

So I was looking at different sources on official forums, Reddit, and other places. But I wanted to make sure by asking this question.

Is owning feudal government counties with an Irish culture going to give the full benefit from development growth from buildings?

So starting with Ireland again on an 867 A.D. start and trying out tribal government again. I decided to convert some welch coastal counties to Irish. After that I looked at the list of things I can build. Specifically the county of Dyfed. The county only shows the feudal buildings.

I also noticed that you can build trade ports up to level 4 within the early era. Should I move my capital to this feudal county? Will this help with cultural innovation at all?

There are suggestions to just focus on your capital with increased development steward task. and then other searches suggest not to do it at all while your tribal.