Christians accept the writings of Apostle Paul as being part of the Biblical canon, divinely inspired by the Holy Spirit to impart relevant truths to believers. Some of the content found in his Epistles is situational, such as his advice to Timothy to drink wine for his health. Likewise, no surviving denomination to my knowledge requires women to wear a veil in church, not even the Eastern Orthodox. But his writings are in large part a divinely inspired commentary, to help believers make sense of events and developments that came before. That is to say, Paul was the author of Christian theology as we know it.
One tenet of this is that there exists a difference between men and women, who were "created male and female" in the words of/to paraphrase Jesus, and that with this difference comes assignment of different roles. Paul made it clear that all humans may be saved and follow Christ in their everyday lives irrespective of gender but part of the rightful gender division includes male leadership.
When you think about it, this makes sense. Men are always the ones who have to take initiative in starting a relationship. They pursue a woman, brave the emotional hurt of rejection, belittlement and vilification in order to establish something long-lasting. The burden is on him to improve himself in order to become desirable, as opposed to a woman who takes desirability for granted. In Bible days he would've literally had to build the house they'd be living in as a married couple, he had to leave the house every day and go out into the world to make ends meet for the entire household. The safety of the family was his duty, and he had to take up arms to defend the family and his community against outside aggression.
In all of these areas he took/takes the initiative, as a leader does. A man is built physically stronger but even in a post-industrial era he has more aggression, which translates either to more destructiveness or more constructive ambition. It's no coincidence that *most* great innovators, CEOs and statesmen are male, as are most felons. A man who doesn't shoulder big responsibilities or goals is more likely to end up wasting his life or in prison, and so the argument could be made that a man needs to be playing a vital role in some project for his own good. The church is meant to reflect the correct order of things, in which humans obey rather than rebel against God, and in which the household functions according to the framework God designed for it. And that includes male leadership. Women obviously do have a meaningful contribution to make in the church but it's to be headed by men so far as circumstance will allow.
