First, any changes that occur are gradual over a period of years, so you will have a long time before you even notice any changes. Those that claim to hear significant changes within a period of a few months are just falling victim to expectation bias.
And you already recognize that tone is subjective, and know that any changes aren't automatically better. But the changes do tend to be subtle, so you'll still have the same basic tone. It'll just be a matter of whether you think its a little better or a little worse.
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