Even if you tap a creature to completely remove the generic mana cost, harmonizing is usually more expensive than casting spells the old-fashioned way, and besides, that tapped creatures could have done something else
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When you force your opponents to make a villainous choice, they will be forced to choose between two options, each one benefiting you
With its affinity for spirits, it comes down cheaper than expected, and once on the field, it continuously produces 1/1 flying spirit whenever your other spirits die or deal damage
Jhoira allows for huge creatures with massive converted mana costs to be suspended for mere fractions of their mana costs, subverting a great deal of their costs
It's also great in a fetchland format as it gives you a versatile mana dork that can swap to one that affects life totals