Equality has become ‘the’ thing.
But things are not that simple. Not simple enough to be explained/solved in such a trivial manner.
Equality is a theoretical concept. It doesn’t exist, as such, in nature. Nor in practice.
Two ‘objects’/issues/items are declared, by us, to be equal if the differences between them are smaller than a threshold. Instated, again, by us. Mathematics – a theoretical field by excellence, being the only domain where the difference between two equal ‘objects’ is exactly zero.
On the other hand, societies where people consider themselves to be equal fare better than those where the differences between people are ‘manifest’.
Hence ‘equality’ must be important, right?
‘Societies where people consider themselves to be equal’…
The key word here is “consider”, not “equal “.
In this situation, equality is not only a concept but also a value.

The fact that a functional majority of the people living in those societies consider themselves to be equal creates a certain ‘environment’. A situation where those people actually complement each-other. A society which works as an organism. Not as a shoal of fish nor as a simple herd. A society which works a community.

A single parent can raise children. But two parents do it a lot easier. And, in most cases, better.
A single parent can adopt children. But no single parent, man or woman, is able to give birth to a child without being helped by a member of the ‘opposite sex’.
Societies where people consider men and women to be equal fare a lot better than those entertaining other beliefs. Which doesn’t negate the fact that men and women complement each-other. In a lot more situations than those in which they merely reproduce themselves.
Economies where the market is free fare a lot better than those where the economic decisions are made in a centralized manner. The communist camp – where the economies were run by the party, had crumbled under their own weight. Which strongly suggests that no matter how skilled it may be, a central planner will never be able to balance such a complicated process as a whole society/economy. Monopolistic situations, where decision making became too concentrated, invariably ended up in a pile of mess. Another proof that no decision maker, no matter how skilled/well intended, was ever capable of managing, by itself, a really complicated situation.
What is the real difference between a free market and one where decision making is concentrated in an unsustainably small number of hands? Or heads?
Economic agents are equal? Suppliers are equal among themselves, buyers are equal among themselves and suppliers are equal with buyers?
Or suppliers complement each-other in adequately supplying the market while buyers and suppliers complement each-other in maintaining the market afloat?
Which brings us back to where we have started.
Where people who complement each-other have reached the conclusion they’d better consider their complements as equals. And treat each-other as such.