DST was never about farmers, it was to conserve energy for the war effort. Farmers also aren't punching a clock at an office. They can start and end work when they want, based on the weather and daylight that suits the work.
If you have animals you are up with the sun, nothing about when you want to work.
I grew up in rural Oregon, if there was rain forecasted and the farmer was in the middle of a alfalfa or wheat harvest, they would be up in the middle of the night with a combine or bailer to get the harvest done before it gets soaked and potentially destroyed.