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Using a boost circuit to boost a pack voltage up to a higher voltage to drive a higher voltage motor does introduce some electrical losses.
So using a battery pack with a higher voltage would be a better idea to avoid those losses.
However there may be other factors that make the boost circuit better even with its losses.
For example by using a boost circuit and keeping the battery pack voltage low you can use lower voltage chargers that are normally cheaper. The battery wiring is safer if it is a lower voltage, handy for DIY builders that may not use a sealed battery pack module.
Contactors, fuses, etc may be cheaper when using a lower voltage.
So there may be designs where using a boost circuit has advantages that outweigh the electrical loss disadvantage.
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