Why is an Access annotation needed? Do I understand how it works correctly?

Question

Java

Do I understand correctly that it is only needed to read annotations from attributes / getters? Can you write which of these statements are correct and which are not?
If the class has Access.FIELD, then annotations will be read from attributes, if PROPERTY - then from methods.
And if the class has FIELD, and one method has PROPERTY, then annotations will be read for the entire class at attributes, and where PROPERTY is at the method.
And the question is: why do this? Why write these extra. annotations, when you can just change the annotations in the code itself for accessors / attributes?