The Chinese Unique Tech Great Wall is a relatively less useful tech, giving bonus health to walls at a significant stone cost. In most cases, you’re better off just building a second layer of wall instead.
But the recent videos on how Rams block arrow fire from fortifications gave me an idea! Make Great Wall block arrows with both hit type one AND two. In other words, most archers would have a hard time shooting over walls to hit units or buildings behind them.
This would give the tech an interesting niche and make it worth using sometimes, which would be nice.