Most of the time, I see people talking about their own plan and their own choices. Not people telling others what is and isn't allowed. Sure, there is a bit of that, but not much. I read most posts as being people responding about their own plan rather than spouting off about THE plan. There is a difference.
Have a milkshake if you want. It isn't for me, not only do I avoid sugar but I am now lactose intolerant. But if you want to try it, try it. See how your body reacts. See how the scales react.. Listen to your body and make the right decisions for you. Understand that others will question the sense in you taking such a high sugar and high saturated fat option but do so because you actually believe it is the right choice for you, not because you are fooling yourself that it is a healthy choice. Because a traditional milkshake will never be a healthy choice.
There is no judgement in this. I am just saying it like it is.