As with all cooking, there is a lot of discretion and personal preference. Just blindly following recipes which state 7 seconds chopping speed 10 is not a good idea as depending on season and variety some items may turn into a pulp when you are looking for a fine chop etc.
Being able to control temperature and to have it stir make things like a risotto, custard or hollandaise so much easier to make.
So it is perfectly possible to produce bland poorly cooked food with one. There are very few things it can do that you cant in a normal kitchen, but the convenience is huge.
My magimix would not be able to turn sugar into icing sugar, but the thermomix is significantly more powerful.
It sounds like part of the key is making it stay in its lane. It's ambitions must be kept in check. "You make great sauce hollandaise, better than many; there is no need to try turkey stuffing" you explain in soft tones while stroking its hair gently.
It sounds like part of the key is making it stay in its lane. It's ambitions must be kept in check. "You make great sauce hollandaise, better than many; there is no need to try turkey stuffing" you explain in soft tones while stroking its hair gently.