Depends on how you look at min-maxing. My approach to min-maxing Stardew is minimal effort, maximum value on the farm. I don't want to spend most of my day every day on the farm feeding animals and watering plants.

So I try to plant the stuff that produces the most value and get sprinklers and stuff early on. That way I have more time to do the stuff I enjoy more in the game, adventuring in the mines and fishing.

If you're trying to wring every possible dollar out of every minute of game time, I don't view that as min-maxing. It's just plain maxing.

But I suppose that's really just quibbling over definitions.