Well current draw is an indicator of how much power it has since V * I is Watts which directly translatable to HP after taking into account motor efficiency (which are actually quite high).
May not indicate how efficiently the HP power is used to create airflow and suction but generally more power means more airflow and suction (the I and V of vacuums)
And for power tools it is an excellent indicator since so many list the "peak horsepower" which is just a marketing lie.
But I do understand your point regarding boot times.
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