GC gear is for the casuals who want good gear. It's good gear so it takes a while to get the nice stuff like the LT weapons and armor set. Don't have the time to get Relics or don't have a good LS for Primals? Work on these over a long time to get it.
And Relics are for those who have a lot of time to spend and who want really really good weapons. Although I dislike the RNG from the pit of my soul, the best weapons aren't meant for everyone. Don't like it? Skip it.
All content isn't meant for everyone. Do Garuda and get those weapons instead. No 100% dependence on RNG so it won't take so long and it's skill based and not luck based so there's no real complaining about it other than "Boohoo it's too hard!". There's even the cheaper GC weapons that are pretty good. I use the GC axe on my War for that +50 HP and I love to use it more than any of the primal weapons so there's no shame in it.

Seriously, it's not for everyone.