I wouldn’t be too upset (if at all), honestly. A +5 magic-type platinum mace is stronger than any variation of the healing mace. Granted, the platinum mace bestows Curada, but that’s only really useful for clerics like Macherie and Cadia since Arithmeticians have better/faster options.
The difference in mag is marginal bc what matters is the 15% damage, and the lack of having to use acc/agi/crit seals also feels better
The real problem is gumi may someday fix the growth rate for maces but only if you start over