Totally disagree. 1) im 99% sure that some colors we cannot or do not precisely recreate using non natural dyes. Just thinjing about the complexity of organic material: that is bound to produce subtle textures and such that are not easily mimicked.

2) there is a spiritually satisfying element to recreating something in the original or natural way when a more complex way may be easier

3) it is important to preserve the heritage of human innovation. These techniques and recipes ought to be preserved for historical and sociological reasons, as well as in the event that shit goes to pot one day, we may still have some people that know how to make dyes from scratch.

I just saw a rose garden with differently colored roses, and some made me think: this is a color a computer screen can't show

This is clearly something you'd need to see in person to understand before making a statement like that.