There are many of these. Some people also get more pieces a higher level and therefore not need to upgrade as many pieces. They essentially hashed out what to unlock roughly when and it's clear no one checked if there is actual parity between covenants. I mean kyrian adventurers are useless while nightfae have an indestructable easy mode combo that can kill everything no matter what. For necrolords you need the raid weapons to complete the armor look, for kyrian you need the (admittdely) expensive renown items. This stuff is all over the place if you play multiple covenants. Path of ascension kinda needs skill, the night fae garden certainly not. The kyrian daily treasure is a little dodge game, the necrolord chest requires you to kill alot of enemies usually.