Maternity leave exists. It has to be factored in , it is factored in but just occasionally could it be acknowledged that it might just, occasionally, make life difficult for employers and other employees?
Well, it is difficult for employees if the employer hasn't adequately managed the team in a way that it is able to absorb the entirely normal patterns of absence that employees will require: holidays, sickness, mat/pat leave, etc.
Yes, it's a "burden" on employers that their employees are not automatons who have no purpose in life beyond ensuring their uninterrupted availability 9-5 each weekday. Humans get ill. Humans reproduce. Humans change jobs. Humans get distracted by their affair with their secretary and fuck up the smooth running of the business. If you don't want to deal with that, don't hire a human. But if you want (or need) a human brain to do the work, then you need to accept the issues that come with humans and a well-functioning society depends upon a safety net when people need to be temporarily unavailable for work.
If you want your employees to commit to working only for your company, rather than hiring themselves out to whoever is willing to pay them the highest rate on any given day, ditching your task mid-project, then you have to give them some sort of commitment back in return. Which is, you won't fire them if they get ill, have an accident, or have children (something which the entire of society depends on people to do). Otherwise hire, and pay, for a day-rate contractor.
If your company budget is so precarious and poorly run that you can't afford to employ women in case they have children, and can't hire people with disabilities in case they are unable to work, and can't hire men who might want to take paternity leave, then ultimately it's you who will suffer long-term, as all those talented people will work somewhere else, leaving you with the industry's dross that couldn't get a job at a better employer.