What is the point in investing all that time and money to train fighter pilots if they are not allowed to do their job during the only time that matters? I think the PAF should either not recruit single sons or else do away with this unusual exemption.
As for women fighter pilots, well that is just sexism, and that really should be consigned to history as soon as possible by all nations.
In the modern age, women should have the same rights and responsibilities when it comes to the defense of their homeland, especially in all volunteer cases.
If those women are willing to put their lives on the line for their country, what right does anyone else have to refuse them?
I would think it perfectly acceptable for women to participate in extremely physically demanding military roles like frontline infantry and special operations units provided they can make all the grades.
If they are as capable as their male counterparts, then there is no reason to categorically deny them places in those services or hold them back during war.
The only time I would consider holding them back as being appropriate is if the enemy was an unconventional force, or a conventional force that does not follow the rules of civilized warfare and the women would likely be subject to sexual abuse if they fell into enemy hands.