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Motors like dust extractors running with all gates open, or with no filter attached, can overload and overheat. I am no expert when it comes to slider motors, but a sawblade is very light in weight and the difference between running our saws for 20 mins with blade installed but not being used to cut anything is surely negligible compared to running our saws for 20 mins without a blade installed at all. Sure the brake would stop the arbor rotation very quickly, but that would be it.

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Dust extractor motors will pull more current when moving more air.? If you do not have a filter attached and no duct, the impeller will pull through an incredible amount of air and force the motor to use more amps than it is rated for.

Table saw motors are different and will only pull current when under more load.? The motor will like only pull about 20-25% current if you do not have a saw blade attached.? It should be no problem.

-Aaron