Think about it.
What is the difference between fetching in spite of, and in response to?
And Force Fetch isn't about fetching whats.
It's about fetching whens.
If the dog understands what the pressure means, it will respond to it by fetching WHEN it doesn't want to fetch.
Demanding that a dog respond to the pressure by fetching someTHING that it doesn't know it's supposed to fetch, is ridiculous.