[heinrichhartman]

In my experience, math is 99% handwriting. You only put it into Latex once you solved the problem. Exploration and experiments are done on with pen and paper.

This is also the reason why notation is often terse, and highly domain/author specific. You get tired of writing long_variable_names very quickly if you do it OVER AND OVER by hand. Now think about how much work and confusion it would be to replace those symbols with little paintings...

[alexvoda]

Math exploration and experiments are done on pen and paper because the notation is incompatible with keyboards.

I assure you there is plenty of exploration done in tools like Jupyter.

[SiempreViernes]

I think this can just as well be an argument that this is all safe as it implies the only emoji used will be those that can easily be handwritten.