Social skills is another way of saying the abilities required to function in a society. You might as well ask why do you need to learn to swim to get in the pool.
Even if one is uninhibited socially, it’s unrealistic to expect them to be able to function how society often dictates or requires.
Last I checked, this world is pretty cruel, especially to those who are vulnerable.
Some people need floaties to stay afloat. Some people need a life jacket. Some people need a solid platform to dip their feet in. Some people fucking melt when they touch water. Whatever accommodation they need or whatever their situation, it’s all perfectly acceptable in my book.
We can help them to thrive without breaking a sweat with our empathy, technology, and ingenuity.