Indian camels are too stronk

https://www.twitch.tv/videos/470316810?t=01h19m56s

,

I dont understand why they have bonus pierce armor. Its too easy for Indians to stick to camels all game from castle into imp.

.

Feudal age stable -> scouts

Castle age stable -> camel

Imp age stable -> imperial camel

.

The streamlinedness of this is insane. And the camels get bonus pierce armor as well? I think it is too much. What do you guys think?