Lets outline where we're currently at:

Uprisings, PvP & the Dxun operation are all not level synced.

Flashpoints, all ops other than Dxun are level synced.

Alacrity is still tiered for instant cast abilities. (T1 = 1.4s GCD, 1213 rating. T2 = 1.3s GCD, 3206 rating.)

Level sync caps your Mastery, Power & Endurance to specific values. % bonuses bypass these caps but any flat rating increases will not.

With the boundaries laid out:

There are 5 dps-advised relics in-game. Focused Retribution (mastery proc), Serendipitous Assault (power proc), Boundless Ages (power clicky), Devastating Vengeance (crit proc), and Primeval Fatesealer (alacrity clicky).

Of these, mastery & power proc are considered the best DPS gain and so are most useful for uncapped content.

For capped content: power & mastery are worthless (3 relics gone) and alacrity has no purpose for instant cast classes running T2 alacrity (lethality).

So: Lethality has one viable relic choice for capped content: crit proc. The alacrity relic has no purpose for lethality once we've broken the T2 alacrity rating barrier, the power & mastery relics will not affect our dps at all in capped content.

And so we get to the suggestion: Lets add 3 more relics to the mix. Lets add a counterpart to the ephemeral mending relic, a counterpart to the power and alacrity clicky relics, and (if at all possible) lets add a level scaling version of the matrix cube relic (and give classes a reason to go hunting for the matrix shards. That was a fun little minigame back-in-the-day.)

My request: give us back the old 4 relics which did straight damage to an enemy target. Cerulean Nova, Dark Radiance, Elemental Transcendence & Kinetic Tempest. Give us a new critical clicky relic, 30s duration, 2314 stat at the Mk-19 level as per the alacrity clicky. And give us a scaling, or scaled, version of the matrix cube please.

The 4 split damage relics give us some more variety for building and working with amplifiers (i.e. tech wizardry)

Dark Radiance (Internal Proc): tech class WITHOUT armor penetration

Elemental Transcendence (Elemental Proc): force class WITHOUT armor penetration

The Kinetic Tempest (Kinetic Proc): tech class WITH armor penetration

The Cerulean Nova (Energy Proc): force class WITH armor penetration

but anything which would not be rendered useless by level caps (i.e. similar to ephemeral mending) would be welcome.