User blog comment:Nikitazero/Further statistics standardization/@comment-27274076-20190916164634

I asked for this discussion because I doubt its use in Age of Empires III pages. We use this notion for unique units in Age of Empires II to avoid questions like 'Why is Blast Furnace not listed on the Cataphract page?'. It makes sense because all technologies (bar unique technologies, naturally) are common technologies generally available to most civilizations.

However, Age of Empires III is very different as there is much less common content and a lot is unique or generally available to only a group of civilizations (e.g. Europeans). Therefore, I doubt the reader would expect that all technologies are applicable to any unit, building, etc., anyway. The notion is also somehow confusing.