Hello Deeksha, I may add to what has been said by learned member,
I couldn't guess what prompted you to think in these lines. Human beings are social animals and animals will have their life cutout. In the evolution of human kind, everyone has reached a stage that “man does not live by bread alone”. Because man does not live by eating alone, he also has to make his life "meaningful". If eating alone is the only 'life', man should have stopped growing grains no more work. But after thousands of years of human life, we needed many things other than bread. We work, earn, eat, clothe but also have to do many other things. We are not machines, machine can be idle once switched off, it can remain as a machine. But man ? imagine and try to be idle, doing nothing. Don't speak, don't hear-laugh-weep-quarrel- fight-move around and so on. Try for a day, you can't. Even a mad man can't remain frozen. That's what social life means. We have certain duties to perform outside office work/duty. We don't feel like alright, unwell and attend functions, go for shopping, worship, travel. Family & domestic obligations to be fulfilled at any cost. Even a sage/hermit/recluse/eremite who renounced worldly affairs got some other duties to perform. And for that require off-duty and thus leave is availed. No matter you call it by any name. Why for instance, many units still don't have a kind called Casual Leave. But still, they would have EL or PL, Sick leave, Maternity leave etc. Yes, you are right, persons like peasants/farmers, freelancers will have no leave of these kinds but they may take 'leave of absence' from their routine. No approval from anybody would be required. They are not employees but professionals. So ultimately you have to shun the tag of 'employee', become a professional/self-employed to eliminate 'kinds of leave'. Will you ??
But every citizen has to abide by the law of the land and governance enabled/done by various pertinant regulations & stipulations to ensure minimum requirement. One among them is Leave policy. Policies may defer but leave stay-put in one name or the other.