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Turning them on doesn't reduce the security. The issue is unlocking them.

As far as the security of the data on the device is concerned, a powered-off device is equivalent to a powered-on device that hasn't been unlocked since it was powered on.

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Pro tip: on newer iPhones with either Face ID or Touch ID, holding the sleep/wake button and the volume down button for some time puts the device in a mode where Touch/Face ID are disabled, the phone is locked, and the device passcode is required to unlock.

Touch/Face ID are also disabled when you boot the phone, so turning it off is sufficient.

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