It change your public IP, so when you swap server the services you use will see another IP from you, if you swap server constantly supposing someone it’s trying to find out where you are they will have a list of different places and it will make it harder to know where you really are so they will desist using the IP method.
There is a variety of measures you have to take to be secure, swapping servers it’s just one of them.
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What would swapping servers achieve?
It change your public IP, so when you swap server the services you use will see another IP from you, if you swap server constantly supposing someone it’s trying to find out where you are they will have a list of different places and it will make it harder to know where you really are so they will desist using the IP method.
There is a variety of measures you have to take to be secure, swapping servers it’s just one of them.
Changing the VPN server, just for good measure
That was a rephrasing of the statement, not an answer to the question. He’s asking why it matters. What is the “good measure”?