Superflous steps before wiping a device

What's the rationale behind directing users to attempt deleting their browsing history on a device they are about to cryptographically wipe? Is this step necessary?

Similarly, is disconnecting the Internet, and physically doing so necessary? Performing a factory reset on an encrypted mobile devices renders all the previous content of its permeant memory practically non-existent, and involves a restart of the device.

For laptops and desktop computers, the recommendation already is to do it by booting an external OS or self-booting tool. So shutting down applications and disconnecting the internet is also irrelevant.