Syns are not sins people. And you can use them on healthy things that can aid weight loss in small amounts. Like avocados, nuts, seeds. You could use it on cooked fruit or smoothies. Or on a decent size bowl of cereal. And actually, the free food is so low in calorie, that unless you are literally eating non stop all day, your calorie count will be really low. Possibly too low to be healthy without syns/healthy extras. I know it seems like a lot of food compared to other plans, but that's because free food is food with all the cack removed lol. Other diets often have 'unhealthy' stuff in amongst the food, that boosts the calories of otherwise small meals.
Also, when you have a plateau, it's nice to have something you can reduce. But those of you that could take 6 months to a year to lose your weight: could you really go that long without any chocolate, wine, gravy, mayo, crisps, meals out, ice cream, etc? If your will power is greater than mine, congratulations! But if not, that's why syns are built in. To save you from giving in one day, eating a lorry load of rubbish and quitting