sure if they are made tradable or purchasable via APs.

Sets of trials to be very best of the entire game, but they are not.

I only have experience with the Wise Mage set, this used to be pretty good but now its completely useless.
To make this set useful again the set boni should be changed to something like this:
2) increase spell damage
3) increase spell crit
4) increase spell damage
5) heavy attacks decrease the targets armor and spell resist by 10% (not fully charged heavy attacks should proc this imo)

The Infallible Mage set is similar but with a different order of set boni and should something like this:
2) increase spell damage
3) heavy attacks decrease the targets armor and spell resist by 10% (not fully charged heavy attacks should proc this imo)
4) increase spell crit
5) increase spell damage

Its strange the VR14 martial knowledge is the best gear for magicka users and can be found in any Cyrdoiil delve, while hard mode trails give worthless gear that often gets deconstructed for purple crafting mats. You'd expect the most difficult content would give the best gear, this is not the case and it needs to change.

What I would have like tho, is the chance to change out a few or all of the 2,3 and 4 set bonuses in any given crafted or looted sets. within limits tho, say a set bonus is health regen, you can then only change the typ of regen, say to stamina regen or magicka rege. If the bonus is spell damage, you can only change it to weapon damage etc etc