I don't know why people think that if the relic weapon was equal to or just slightly under the Savage weapon people wouldn't do savage then. You could make the weapon in savage 20 ilvls higher than every other endgame weapon and I STILL would not do savage. People that do Savage are going to do savage cause they like the challenge. The Weapons and Gear are what keeps people going BACK to the fights. AND. Since the loot lock out is so strict in Savage MOST, not all, run savage with a static. They run it once and then they don't run it again till the next week. So you don't have people re queueing for the Savage content to help others or just for the heck of it. Do you think that because the Ultimate fights give weapons, that is the only reason people challenge the content? The weapon is just what keeps people doing the fight once they've beaten it.
Also it's not just the fact that it's meant for casual or hardcore or w/e. The Relic weapon is called that because of it's story. In ARR we were remaking a weapon from Heroes of the past, and then turning that weapon into the weapon wielded by the Zodiac Braves. In HW we were creating a new artificial life and trying to help it grow or come into being, and the only way to do that was to link the life into a weapon cause all other attempts at making said life ended in failure.
In SB our Relic weapons have no story... Went went to Eureka to find out why it disappeared. Not to discover so lost and ancient weapon. When we get there Gerolt says, "oh... maybe we can enhance a weapon with the elemental aspects of Eureka." And that's all we've been doing since the first steps... just adding more and more elements to it till the current weapon can't hold any more and then it gets remade into a new weapon...
For me personally I have always equated the Relic weapon of FFXIV to the Character driven weapons or the Ultimate weapons main characters get in single player FF games. Such as Clouds Ultima Weapon, Tidus' Caladbolg, etc, etc. I equate the Savage weapons to those secret weapons you can find in later games that may be just slightly better or have different abilities on them that may make you choose them over your character weapons.
In sort I want the Relic weapons to be more of a personal quest like in ARR or HW. I want more options to DO the relic. Don't like doing PVP? Do the PVE. Don't like Crafting? Run Dungeons. Bored of all that? Try Eureka for a little while. You balance out those options by making each one take different speeds of progress. For example, they "could" have given us different options of doing the relic weapon in SB such as dungeons, crafting, Eureka, Tomestones, w/e, but made Eureka the fastest route to complete it. People that like Eureka could do that, and the people that don't, could do it for other means.