By looking only at the names listed above, of course it seems that only exceptional people are able to do it. However we common earthlings are also able to display varied interests and abilities. Think of you, a normal adult person. You have a job (or currently in between jobs) and you have a hobby (at least one) which is most likely unrelated to your job. And that's already two different abilities. And if you look at it, very likely there are people being paid by doing your hobby! So yeah, it is a skill you are displaying right there. Adding to the fact that being an adult you may have to cook for yourself, et voilà you are a chef now. Maybe you have kids as well, and there comes a whole train of skills: babysitter, educator, teacher, mentor, policeman, judge, executioner?... with this very shortened list you can probably tell I have no kids. Let's not rush things and step back a little, maybe you have pets, or maybe both kids and pets. Well, suddenly you are entering the realms of zoology, animal caretaker and educator to name a few. If we add our online presence, there is another infinity of abilities we display, from podcasters, actors, writers, teachers, philosophers, game developers, gamers, ... The internet lets us display our inner da Vincis in a whole other level. And there are many people out there creating the most amazing and varied things. Some become more famous than others, but that comes with the amount of time and effort put into that. Which bring us to the main factor that may restrict us from being polymath beasts: time to spend in the effort.
Time, that one precious dimension that we can't really save on, yet! The term "saving time" can be quite paradoxical as we are always spending time, it does not stop for us, as we didn't figure it out yet anyway. However, we usually plan on where we are going to spend our time, it can be a weekly or even last second plan, in the end we always decide what we are about to do next. Some people spend more time points in perfecting that one skill, their calling. Others distribute their time points across many different fields. In the end it is reasonable to accept that we will have specialists in that one particular field or jacks of all trades that seem to be amazing at everything.
So what leads to this? I would dare say one major point, as in many issues that torment us, is our childhood. Events in our childhoods will "design" the shape of our personalities and ultimately our interests as well and how much we are willing to spend on them. It is since childhood, across many societies, that we start to have boundaries set in our destinies, and have defined that we will find our calling, that we are set to be someone in the near future who will be the Master of its field. We are limited on access to all fields, it is almost a Marketing strategy where we are having our options cut short. Thus our education is almost written in stone, with the same program being taught over and over again to every single child, for quite some generations, leading up to very frustrated and confused teenagers, either by totally hating school/learning or by suddenly being placed in a Mortal Kombat towers situation "choose your destiny". Confusing, right? What would happen if education systems everywhere were redesigned is an interesting idea to have, difficult to answer too.