My client for a site using your excellent Hum theme has mentioned that navigation requires two clicks. I have searched for an explanation and eventually found that iOS interprets the first click as :hover (please see great article on this).
Another iPad user tells me that this happens on many sites. I do not know if this has been addressed in later WP standard parent themes, or whether a fix in the parent or the child theme is the way to go. I am tempted to try a fix on this one site but the issue seems a wider one, and one not mentioned in the WP forums as far as I can see. Do you have any views on this, please?