(No) this answer is not malicious or just like that.
The clan banners stand for the peoples of the areas, these peoples have been in the EL and on IoS for half an eternity.
Thus, a freshly colored banner would not be appealing at the time.
Even if we can make banners ourselves, you have to look at them more like collected ones and since the tribes have been there for a long time and the banners have therefore been exposed to the weather, they have to look washed out and colorless.
I hope my statement doesn’t come across as too harsh.
have a nice day. ᕙ( • ‿ • )ᕗ