No love for exisitng customers

I'm a loyal reliable Xfinity customer for 6 years with paperless bank account billing.

Now seeing the five-year price guarantee plans (with unlimited data) offered to new customers only - but not existing customers.

Why are new customers offered a much better deal than loyal existing customers??  Can someone from Xfinity please explain that to me?

Instead I'm punished by being forced to re-negotiate a plan every year (a miserable nightmare experience) or by default forced to pay more because the "promotional" offer has expired.

To be fair, I am satisfied with Xfinity's service. But the annual one-year contract plan renewal is a major hassle which I dread and abhor.

Comcast CEO Brian Roberts said "The team has a sense of urgency, energy and focus to getting customer pain points resolved".  So far, as an existing customer, I'm not seeing it.