Eventually anything enjoyable can be turned into torture if pacing is off.
You may like mashed potatoes once or twice a month. The problem comes when you realise that with each spoon of it you start to see blue rectangles, try to reduce speed to 40 and hear the dingding of your cargo scoop.
If you grind hard enough you can remove all the fun from anything. That's why the happier players all say don't do it.