I basically never use shards since it takes very little time or stamina to level a unit to 20 through training tower, but I occasionally use the crystals for units I dont really want to bother with, for things like quests.
They dont seem that useful in general, shards just seem useless to me, and you need so many crystals to level a character up that you basically use up like several months worth on one character.
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Fate Grand Order
Dragonball Legends
IV Calc
Heroes