There is very, very little lvl 75 gear that is in significant demand at this point, although you did hit on a few pieces.
Defending ring is still the best damage mitigation ring, and for most jobs, piece in general, and thus remains in high demand.
Brutal earring can be useful, but normally only in combination with another DA earring that is obtained through high level content; otherwise, there is a relatively easy to access earring set from delve that is better.
Rajas ring is useful in some builds. There are a few other pieces that have some specialist value, for example in idle sets, but particularly because of the new reforging process for AF and Relic armors, those pieces that did have niche purpose are now outclassed.
For the most part, lvl 75 gear is either obsolete, or in the case of relic and AF gear and relic and mythic weapons, they are a stepping stone to improved ilvl versions.
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Renatus (Titan)
"We are Dragoons, and to make short work of foppish cavalry is our bread and butter."
-Bob Shaftoe, The System of the World