If you read the page about the myth, I think the main takeaway is not "mobile users aren't distracted" it's "mobile users are no more distracted than non-mobile users." Therefore, don't require any user in any context to provide 50 data points all at once; design a signup form that can be completed in under 60 seconds regardless of device.
The secondary takeaway is mobile users are more likely to be at home or work than roaming around. I'm not sure what affect that has on UX, maybe as counter to the above, giving users the option to put more time in to a task and/or do one that's more complex.
The secondary takeaway is mobile users are more likely to be at home or work than roaming around. I'm not sure what affect that has on UX, maybe as counter to the above, giving users the option to put more time in to a task and/or do one that's more complex.