From what I can see you have a real penchant for the Pre-Romanesque and Romanesque architecture, with one of the examples presented being described as being Baroque (Church of St. Euphemia, Rovinj) which is hilarious as that style is FAR from being humble with all the embroidery and paintings.
Gothic architecture is just the evolution of this style of this construction anyway built in places that didn't see the development of Romanesque architecture as they weren't the core parts of the Roman Empire. Not that I am saying we can't or shouldn't have it mind, but one of the reasons we even had Romanesque architecture wasn't because it was supposed to be humble, but more because people didn't know how to build stuff any taller then it was.
It's just the change of style over time by the people who lived and in and took part in the faith and wanted to emulate the styles used by the former Roman Empire.
By extension to Starsector, would they be building Domainesque architecture? Who knows really. Gothic or Romanesque are not too removed from one another really, just styles of building a really big building as it took people at the time, not greater or lesser.