Here is almost the only legendary artifact that F2P, low/ medium spend players can earn in the game. We don't have any issues with it seeming less powerful than 'premium' artifacts because it's free.
But you know what? Currently, my server has only three people who can reach level 180 in Fey Meander, while the Trial of Pillars is even more challenging. Those who complete both of these challenges almost all have very powerful legendary artifacts.
You create rewards that F2P players can achieve, but with the current difficulty level, F2P, medium spend players almost can't achieve it, and for VIP players who can achieve it, this reward doesn't seem very appealing to them either, does it?