Why is the research on artificial intelligence at this stage all researching on a separate ability? For example, train the visual ability of the computer alone, train the speech recognition ability alone, and train the natural language understanding ability alone. Why not train these abilities together at the same time? Does anyone think this will lead to better AI?
There is a large field of AI that indeed does this. It is called multi modal learning. It is a very active research area, especially in the last few years.
For more information see: https://en.m.wikipedia.org/wiki/Multimodal_learning