I’m not sure why this is downvoted, the strips are indeed a lot more accurate.
It's that or there are people who actually think that counting days is a good way to enable unprotected sex without a risk of baby. Which is absolutely isn't - it changes the risk to 2-5% a shot. Compared to around ~2% year for condoms alone.
* For myself, I find that the Americans who try to force everyone else to follow their personal positions to be insane Authoritarian Fascists. Our society only works if people have freedom and personal choice.