The closest Assyria has to a great female leader is a Catherine de Medici type figure: Naqiʾa, queen-mother of Essarhadon, but she has very little to recommend her over any of the Sargonids, including her sons. Semiramis was a fetishized Greek myth. The queen she was based on is known from a single inscription and ruled at a low point of Assyrian history; she would be a horrible choice for a civ that has a litany of great leaders. The only really viable queen regnant in ancient Mesopotamia is the Sumerian Kuĝbau (Kubaba) of Kish. That being said, I think there's plenty of room for both Babylon and Assyria: Babylon focused on science and administration, Assyria on culture, monument-building, and warfare (not unlike Civ6's Persia). That Firaxis couldn't think of a design space for both doesn't mean it's not there.Babylon - In both civ 5 and 6, Babylon has been a game-breaking civ; it’s clear at this point the devs don’t know what to do with them. They should use this slot instead to bring back Assyria, who has a great female leader (Semiramis), was just as important to the ancient history of the Middle East, and that firaxis has a better track record with.
The problem with this is that Early Modern Sweden was a superpower, which the Kalmar Union never was; meanwhile, the general public wants their pop culture Vikings. I'd be all for cutting the Vikings and restricting Scandinavia to the Lion of the North, but realistically that won't happen. I rather enjoyed what Firaxis did with Norway; I thought they were more flavorful than just bog-standard Vikings. I hope they continue to surprise us in that way. Another possibility would be a Denmark civ that is both Viking and Kalmar.Go down to 1 Scandinavian civ - Having both Sweden and "the viking one" is not great. The swedes did plenty of Viking things in their own right, while is also denies Denmark/Norway the chance to be anything other than a stereotype. There is no reason you couldn't condense these into a single choice, or even go all-in with the Kalmar Union, and have all of Scandinavia under 1 leader.