The flipside of this is that mineral precipitation (though not necessarily carbonate) is also a problem for CO2 injection into aquifers, which are more readily

The flipside of this is that mineral precipitation (though not necessarily carbonate) is also a problem for CO2 injection into aquifers, which are more readily available and for which we have better understanding, better technology and better infrastructure. (No disrespect for the CarbFix people implied, they do great work.)