"Earth-exodus" colonies are a horribly foolish pipe dream baring some major breakthroughs in launch methods and transportation systems. The math just doesn't add up for moving vast numbers of humans from earth to another planet, they don't even add up moving vast numbers from Earth to our own moon. It costs too much and takes too much energy to even reach low earth orbit with current and foreseeable future tech. However, colonies on other planets where humans actually settle, not just visit, and produce their own science and culture are a very important part of humanity's future.
If you are arguing for the best method when the goal is to maximize the chance of human survival into the far future I probably agree with you.. though I don't really have an opinion.
Also, are you suggesting that women can't do skilled work? Population doesn't have to explode initially after touch down with every single colonist getting pregnant at once, but after the initial base is established then the growth of the first generation can begin with a fraction of the population becoming pregnant. They can continue doing their jobs for the majority of the time, shifting to lighter and lighter duties. A handful stay pregnant at any given time, and eventually you can bring the first generation to 3-10 times that of the initial colonist base. By having the entire initial crew as female you allow a greater selection of initial female sourced genes (sperm apparently stores better and is more viable than eggs), and each mother is required to give birth to fewer children over their lifespan there.
I was arguing that your statements do not apply if the mission objectives do not include having children on Mars, and that I believe it more likely that a reasonably current mission will not include such an objective.
Given my guessed objective, I deem gender likely to be irrelevant.
I also believe that a pregnant population that is raising several small children and babies will have some difficulties, though there might be a positive psychological aspect.
What is one useful thing that being male is going to give you when trying to settle another planet? Currently the only advantage that either gender has is the female womb, which we cannot yet replicate or remove and store. Male sperm? It can ship very well, and if needed a resupply mission of it can be sent by way of an unmanned probed...
Again, if the mission objectives include having children, I don't really have an opinion but probably agree.