This is not ceding Control, it is a case of reaching agreement.

That is precisely my point. Almost everything that is potentially controllable needs an agreement between two or more parties. Neither side is "in control" of that.

It was given as a silly example, I know, but both the butter and the bread on my buttered toast are subject to agreements and business priorities. If a business produces butter according to EU standards and we have a different set of standards then it is entirely that business's decision whether to do something special for us or not. So in neither case are we 'in control'.