The problem really is that the game demands that every civ MUST have a unique unit and MUST have a unique building, and many don't.
The biggest problem is every civ MUST have a voiced leader but a lot of the times it can be hard to find a good leader choice let alone voicing them.
But what is the typical English building? English brick houses look different from Scottish stone houses, but I would be hard put to name something as distinctively English as the stave church. Maybe the pub. Royal Navy dockyard? How is that different from anyone else's dockyard? You might as well call it the English dockyard and be done with it.
The majority of UB/UI/UDs are
not buildings with unique architectural styles but institutions with unique significances in a civ's society which took the form of a "building".
e.g.: Château, Golf Course, Hacienda, Ice Hockey Rink, Mekewap, Mission, Open-Air Museum, Outback Station, Pā, Pairidaeza, Polder, Qhapaq Ñan, Rock-Hewn Church, Roman Fort, Terrace Farm, Stepwell, Ziggurat, Basilikoi Paides, Marae, Ordu, Tlachtli, Sukiennice, Prasat, Stave Church, Madrasa, Grand Bazaar, Electronics Factory, Thermal Bath, Film Studio, Observatory, Seowon, Acropolis, Lavra, Ikanda, Suguba, Royal Navy Dockyard, Hansa, Oppidum, Street Carnival, Hippodrome, Bath, and Mbanza.
——These are all actually institutions, not buildings or improvements or districts as "buildings."