Hi WadeB,
Like most things having to do with mattress design it really depends on the overall design of the mattress and the layers inside it and the firmness of the core along with the thickness and softness of the comfort and transition layers, your weight, and how close to the edge you sleep with more concentrated weight. There is more about edge support with latex in post #3 here. Latex is a very “supportive” material and in most cases latex mattresses don’t have edge support and for “most people” this isn’t an issue although there may be a bit of an adjustment for those who are used to firmer edges either for sleeping or sitting.
Phoenix