This should be how you treat new things. OTOH, while economists say “sunk costs are sunk” and should thus be disregarded, in real life switching has often-underestimated costs (including reputation) so skipping out on things at the first sign of trouble is usually bad.
But the problem I have with it is that this is essentially the life advice you'd get from a good friend after the 3rd beer in the pub, yet it's on Mark's website where he presents it as dating advice in a way that makes it sound like it's the truth and everybody should do it. I would've wished for at least one sentence where he declares "Fuck Yes or No" his own thought experiment or approach to dating.
But I guess more cautious and less self confident writing doesn't make as much money.
It is pretty widely held advice in investing, at least.
To be fair he wasn't the original source either.