It's not clear to me, of course, why anybody who gets neither overtime nor equity would want longer than 8 hour shifts. Maybe because making other people richer is so much fun?
Now that there will be a higher overtime rate, it can, in some cases make sense for businesses to hire more employees rather than to pay existing employees to work overtime. For employees who choose to work overtime, that's bad news.
If your job options are limited (few readers on HN know what this feels like) then any paid hours are better than none. A 10 hour shift means 10 hours of money. Now it will be 11 hours of money. Except your shift will be cut to 7h.
If someone makes $10/hour and they work 8 hours, they make $80.
If they work 10 hours at $10/hour here is the difference between overtime and not overtime:
With Overtime - $10/hour X 8 hours + $10/hour X 1.5 (overtime pay) X 2 hours = $110
Without Overtime - $10/hour X 8 hours + $10/hour X1.0 (reg pay) X 2 hours = $100
The worker still gets paid for 10 hours, but because the first worker gets overtime, they make an extra $10. The reason overtime exists is to prevent managers from requiring workers to work 16 hour days etc.
Were you never a teenager? In fact these laws have made it prohibitive to higher local teen agers. Eventually, the trouble of hiring will overcome the initial capital outlay for robots (which can now even do berry picking). You are going to chase people out of work.
Learn about the subjects you are discussing (farming and economics) before coming to wild conclusions.