Sadly, this is beginning to look more like a pointless question.
Yes I agree. The illustrations commonly used are over simplified and do sometimes infer that the warm air mass emanates from the centre of the depression and that depressions are circular and tight. This is not true. They vary in size and shape and the existence of cold/warm sectors are also complex in effect, shape and size. What is known is that warm air increases the density and so the pressure will therefore oppose the effects caused by the cold air mass. The distribution of pressure will be different in the warm air than that in the cold sector and cannot be depicted by straight or curved lines except as a simple illustration when a deeper knowledge is not required. You certainly cannot teach that the pressure distribution in the warm sector is always linnear because it rarely will be.