Just how many more European civs should they add, if any?

Here is another data for your consideration.

Old World Number of People Groups vs Civilization Count Comparision

Region Name People Groups %age Civilizations %age Representation
Africa, East and Southern 1315 10% 1 2% -8%
Africa, North and Middle East 572 4% 2 5% 0%
Africa, West and Central 2220 17% 1 2% -14%
Asia, Central 564 4% 4 10% 5%
Asia, Northeast 711 5% 4 10% 4%
Asia, South 3870 29% 4 10% -20%
Asia, Southeast 1822 14% 4 10% -4%
Europe, Eastern and Eurasia 799 6% 10 24% 18%
Europe, Western 1327 10% 12 29% 19%
Summary

Reference: All Regions | Joshua Project

Note:
Considering only Old World because New World saw radical changes in Colonial Age with its people groups so we cannot correctly compare Modern Age data with Medieval Age. Old world on the other hand stayed fairly consistent.

Region Name
Africa, East and Southern Ethiopians
Africa, North and Middle East Berbers Saracens
Africa, West and Central Malians
Asia, Central Turks Persians Tatars Cumans
Asia, Northeast Chinese Koreans Mongolians Japanese
Asia, South Hindustanis Dravidians Gurjaras Bengalis
Asia, Southeast Burmese Khmer Malay Vietnamese
Europe, Eastern and Eurasia Bohemians Bulgarians Huns Lithuanians Magyars Poles Slavs Byzantines Georgians Armenians
Europe, Western Britons Burgundians Celts Franks Goths Italians Portuguese Romans Sicilians Spanish Teutons Vikings
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