bell curve on results in CO2 doping when done to perfection, pretty much no impact to full detriment for anyone not at perfection already
CO2 is the ultimate, last variable to ever think about unless you are underground and also have to supply your own oxygen where you are and the CO2 is somehow below ambient levels
once everything is utter perfection, like know down to the grams or ml of solution each week, can run your ventilation and know exactly how your routine will hit for the next few months, have your canopy management at god-status, are growing and maintaining drifts on elite clones only, and a few dozen more things, then if you still want to go to another level and have copious amounts of free funds to throw at the grow room, then you begin to think of possible CO2 play
99% AT LEAST of folks you see doing CO2 are utter clowns and might as well be pumping their solar energy into a tank of piss. unless you're recycling your room exclusively, or have a multi-4/5 figure grow room designed from step 0 to completion for CO2 enrichment, then you're wasting it.
those new terraforms are about the only way a regular grower would convert from a tent to a CO2 enrichment facilitating environment with less than a few bands to throw at it
and yes, the nutrient uptake will increase but chances are unless you run lean and force deficiency then mathematically you're almost certainly not sitting on exact uptake, and therefore would be in excess. most new research is showing that the metrics for cannabis are complete clown-trash for majors (which makes complete sense, no cannabis isn't this unique monolith compared to all other plants in the world and requires 50x the nutrients)