I have made a few suggestions over the years, and even made extension mods for them to be tested out - I put a load of the Protoss ones together here: [Extension Mod] All the Protoss upgrades!, although it’s not meant to be a final recommendation per se, especially as the other races don’t get anything (and the cost of Twilight Focus, the Feedback upgrade, is less than what I suggested).
But yes, my suggestion was for a Templar Archives upgrade (that I’ve named “Twilight Focus” and given a picture for in the above extension mod) that restores Feedback damage back to 1 HP/energy.
(I’m not sure about my Fleet Beacon upgrades these days in that extension mod, just to note! If I had to give something to the Oracle now, it would be an upgrade that increases the duration of Revelation… that way it rewards you for keeping your early-game Oracles alive)