[Python] What motivates authors to set different base versions for setuptools in .toml files?

In developing Python packages we have to create a .toml file that has a requires section.

In there there is this setuptools part where people use different setuptools:

requires = ['setuptools >= 42','wheel',]


In this case I used the setuptools >= 42.

Why do some people use the setuptools >= 42 and others just use the setuptools or setuptool > 40.5 or whatever?

What is the difference and the essence?

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