Rewatching the devstream right now, trying to take in the changes, and i just gotta say:
They sell this prism system as a solution to a problem that never was.
The issue the community has brought up these past few months about the virtue system can be boiled down to "courage is objectively better".
Why was courage objectively better? Because it was the only virtue that meaningfully affected pact arcanics. Weapons could all be attuned to courage so there's no reason you would give up ability strength for weapon damage.
There would be no issue with "micromanaging plus minus" if there was an actual reason why we would spec into spirit and grace. On the contrary, people would actually use the freedom this plus minus offer to finetune their build instead of dumping it all on courage.