We assume that this is true nowadays, because two mathematicians from two different mathematical fields can hardly find a common language to communicate.
The question arises: is it possible to reorganize at least the mathematical language?
Is it possible to reorganize at least the mathematical (physical, medicine, cooking, philosphy etc) language? Yes. But why? Some elements of mathematic language were changed. For example, the number: Roma, Arabic, Chinese etc.
Mathematics is only univocal image of laws of the nature into symbols like English, Arabic etc. But the words are ambiguous image of definitions and laws of nature.
Therefore it is no need to reorganize the mathematical (cooking, physics, medicine, English, Arabic etc) languages. The mathematical language is developing and it is good.
Mathematicians can hardly find a common language to communicate" as two cookes from China and Innuiits, as from Africa and Asia (scientific language for specific purposes in native language). Therefore we communicate in English like all mathematicians in the world communicate in mathematical symbols (specific mathematical esperanto).
According to different sources, whether mathematics is too big for the human mind is complex and has been the subject of much debate. The famous logician, mathematician, and philosopher of mathematics, Kurt Gödel, once said, "Either mathematics is too big for the human mind, or the human mind is more than a machine."
This statement reflects Gödel's belief in the existence of mathematical objects independently of the human mind. He suggested that the incompleteness of mathematics could be a failure of the human brain, not math itself.
On the other hand, a study by Amalric found that mathematicians had reduced activity in the brain's visual areas involved in facial processing. This could mean that the neural resources required to grasp and work with certain math concepts may undercut—or "use up"—some of the brain's other capacities.
However, it's important to note that a population of human brains is much smarter than any individual brain in isolation. And the collaborative enterprise par excellence is science.
So, while some aspects of mathematics may be challenging for the human mind to grasp, the collective intelligence of humanity continues to push the boundaries of mathematical understanding.
It is true in the spirit of Leibniz, who believed that mathematics is an inexhaustible realm of "eternal truths" which, according to him, is rooted in God.
Mathematics is vast but not too big for the human mind. Mathematics is just like a big city, you don't try to get to be familiar with all the streets and what goes on there. What we need to to focus in one or a few areas of interest.