Question

Why is it desirable to create an additional commit rather than amending an existing commit?

Answer 1

There are a couple of reasons for this –

The amend operation destroys the state that was previously saved in a commit. If there is just the commit message being changed then that’s not a problem.  But if the contents are being amended then chances of eliminating something important remains more.

Abusing “git commit- amend” can result in the growth of a small commit and acquire unrelated changes.