You're still thinking about this from a present day perspective.
Yes, as it stands now what you say is true. Men derive personal power from stoicism and emotional suppression, our primary value is in how effective we are at shutting down non-essential aspects of ourselves and giving ourselves over entirely to whatever endeavor (usually work). We're also taught that we're entirely replaceable: if you can't put up the numbers, we'll swap you for someone who can.
That is reinforced by our suppression of emotion, as that reduces us completely to whatever output society can get from us. If all you are is a highly efficient machine producing value, swapping you out requires no thought or emotion whatsoever. If you're a complete person with feelings and relationships with your fellow humans, you're no longer replacing Carl - The Production Machine, you're replacing Carl - our co-worker/friend/partner that you've an emotional history with.
But what if we imagine a healthier tomorrow? A world where men can express all of their emotions. Where we're no longer reduced to our most basic aspects and valued from what we can produce, but instead seen as complete persons with a full range of emotions.
All over the world men outdistance women in the number of successful suicide attempts by a wide margin. Some say it's because men tend to choose direct and effective methods (guns, hanging, etc.) whereas women tend to choose slower and less effective methods (pills, etc.). But it's also because there is almost no mental health discourse among men. We're taught to suppress our emotions and to never, ever, show them for fear of being labeled weak and replaceable. When we get to low points in our lives our first instinct isn't to reach out to a friend, family, or professional mental health services. Our first instinct is to suppress and deal with it on our own because that's what we're taught our whole lives.
When we stumble and can't do it on our own, nobody has a clue what we're going through because we're so good at suppressing it and so we feel totally alone and helpless. Is it a surprise that so many of us choose to eat a bullet?
Emotional discourse needs to change. Mental health discourse needs to change. People are literally dying over this.