Let’s start with a thought experiment. We have 2 harvesting modules with the same cycle time. Module A harvests 1,000 m3 per cycle. It has a 10% chance of critting to get 2,000 extra ore. Module B harvests 1200 m3 per cycle. Is there a practical difference?
Well that depends on where the “extra” ore comes from. If they come out of nowhere, well this makes little sense lorewise, but it can be an interesting mechanic. Mission rocks have just enough to finish the mission. So you can end up with some ore (or Azure Ice) left over. You can dock early. You can sell the ore (or Azure Ice) and this can lead to dynamics such as contracts being an ISK sink, some people hauling mission ore (or Azure Ice) to save time. If they forgot they had killrights on them, stopping to pick up mission ore from someone else means they have to make one more warp (to the station to pick up ore and warp off from that station), which means more time vulnerable. This can be interesting.
It would also open up some nice stuff for those ORE modules. I believe they should be special, but making them an improvement over t2 the same margin t2 is better than t1 is just asking for trouble. An increased crit yield from these modules would getting more out of a single belt.
A third cool thing is the Winter Nexus. These belts spawn with a fixed amount and in HS it can be crowded. Critting the rocks having it come out of nowhere gives the Perseverance a nice use during the event. By having crits come out of the ether, they are mechanically different than a yield increase.
But what if the “extra” yield from the crit comes from the rock? Well, then none of those dynamics apply at all. Crit basically becomes increased yield, just with more steps.
I think CCP decided if the crit comes from nowhere, there would be too much minerals sloshing around in the game. So they decided to make it come from the rock.
In my humble opinion, this is dumb. Instead of an interesting new mechanic, we just got a new way to increase yield with more steps. Since having the crit come out of space is apparently too game breaking, I think crits should not be introduced if it is just going to be a de facto yield increase. So I think they should remove crits from the game, refund the skills, and change any laser efficiency charges (the one that helps crits) to laser field enhancement charges.