Hi Syracusa,
Some of your comments and assumptions aren’t correct and there are many variables that can affect the sleeping temperature of a mattress. There is much more information about sleeping temperature in post #2 here. If you have an innerspring mattress that uses memory foam comfort layers and a synthetic cover for example then it can also sleep hot for some people that are more sensitive to temperature because the layers that are closest to you will have more effect on sleeping temperature than the deeper support layers of a mattress such as an innerspring.
While latex is the most breathable of all the foam materials … any type of foam is also more insulating than natural fibers and the cover and quilting materials in a mattress, the mattress protector you use (see here), your sheets and bedding, and the bedclothes you wear can all have a significant effect on temperature regulation. Most Talalay latex is also more breathable than most Dunlop latex which is a denser type of latex. Sleeping temperature also depends on where someone is in the “oven to iceberg” range and on the room environment (temperature and humidity) but there will always be some people who have temperature issues when they sleep more directly on any foam material … even latex.
Post #2 here also has more information about some of the things I would check if you are sleeping warm on any mattress with the most emphasis on the layers and components that are closest to your body. In many cases just changing your sheets or mattress protector can be an effective solution that will add to ventilation and moisture transport and make “enough” of a difference for most people. In other cases adding a more breathable layer on top of your mattress (such as a wool mattress pad or topper) can make a significant difference that would be “enough” for most people as well. Your head and face are also a significant part of how your body regulates temperature so your pillow can also play a role in temperature regulation as well.
I know that it can be frustrating when you are one of the exceptions and it’s easy to assume that your own experience would apply to the majority of others as well but each person’s experience and sleeping temperature on a mattress is unique to them and based on many variables (all the parts of a sleeping system, the person, and the sleeping environment). While there are certainly a few that tend to sleep hot on latex or any mattress that most people are fine with … they are not representative of the majority of people (in the same way that a mattress that feels soft or firm to some people can feel completely different to someone else).
Phoenix