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Well if you use m5.xlarge instances from AWS you were getting 4 vCPUs for your money. I don't expect you'll now get 5...

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No, but the underlying hardware that perviously hosted two m5.xlarge instances may instead host one M5.xlarge and one M5.medium, so that performance is not degraded.

Yeah but AWS doesn't guarantee that "2x m5.xlarge" will meet any kind of performance requirements, particularly your own application's, do they?

So you may suddenly find that your own performance requirements, that were previously satisfied by "2x m5.xlarge" are no longer being met by that configuration, and I doubt AWS will just provide you with more resources at no additional charge.

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