Bitcoin is also a currency, why is its unit so different from the commonly used currency units?

For example: $1 = 100 cents. Not only the conversion ratio of the US dollar, but other currencies also have similar regulations.
So,The same is true for the unit of Bitcoin:1μBTC=100Satoshi.
1μBTC is equivalent to a unit of 1 USD. 1btc=30079 US dollars, this is not customary to use,
converted to: 1μBTC≈0.03 US dollars,
The same unit, the same habits, but a brighter future!

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Example: A bag of bread in a supermarket is labeled: A, $2.
B, 0.00006653 BTC.
C, 66.53 µBTC.
According to the degree to which the currency issued by each country can be continuously decomposed, it is customary to use the third digit from
the bottom as the main unit. For example: 1 USD, 1 Euro, 1 Chinese Yuan, etc.One of the prerequisites for the large-scale application of a standard is
that the unit should be unified and easy to conform to habits. Because it is necessary to consider the understanding and acceptance level of the vast
majority of people, such as the elderly, children, people with low education and so on. Using such a large unit as BTC, it is too troublesome to represent
some daily necessities.
In addition, considering the total amount of Bitcoin issued, the world economy, and the global population, 1µBTC≈3USD in the near future is just
a new beginning。
I believe it...