I would argue that only a small handful of savage players wouldnt care about dyeable versions being available from normal modes. And even then, it is not mutually exclusive to other motivations. Peoples armor and its ability to be dyed is a perk that a lot of savage raiders like due to its a literal sign saying "Yes, I cleared this content." It is the exact same reason why other glamours, such as those from the Ultimates, are not available for completing the normal modes. They are status symbols, and if you remove that from raiders, I hazard many of them will actually be quite mad about it.
You want that dyeable gear, do the harder content. Work for it. IF its really worth it to you, youll learn the fights, work your butt off, and get it. But as it stands, the idea you should be rewarded with specialty glamour on the virtue of completing average difficulty content, and then telling raiders "Oh, you dont need anything special for your endeavors," is a bit silly and self entitled. Be a better player and get rewarded. Thats how it works.
Yeah, but what youre suggesting is this: "Im to lazy to learn to do the content, So Im going to petition SE to change the system to suit my tastes and desires at the direct expense of better players." And youre trying to justify it by saying "Well everyone likes dyeable armor, so everyone should have it!"
The catch is that yes, everyone likes it, so people should be motivated to do harder content, and Savage raiders then do it and get the armor. There is no limitation to you getting what you want, except what you deem as being worthwhile. If you wanted it bad enough, youd put in the work. Instead you dont want to work, and are requesting SE give you the 'good stuff' while not putting in effort and expecting the Savage raiders to just be like "Nah, its totally fine that you guys get the same stuff we do for a fraction of the effort.