what is the meaning of as to?
There is no social problem it is more incumbent upon us to understand than this of the role of custom. Until we are intelligent as to its laws and varieties, the main complicating facts of human life must remain unintelligible.

Until we are intelligent as to its laws and varieties

be intelligent as to ? what structure of grammar is this？

as to means about？

Question

what is the meaning of as to?
There is no social problem it is more incumbent upon us to understand than this of the role of custom. Until we are intelligent as to its laws and varieties, the main complicating facts of human life must remain unintelligible.

Until we are intelligent as to its laws and varieties

be intelligent as to ? what structure of grammar is this？

as to means about？

Answer

In this example "as to" means regarding or in reference to, or as you've said "about" is correct. You would not replace "as to" with about in this sentence though.