NortonLifeLock has no need for .Symantec.
.Symantec is the latest dot-brand domain name to be dropped by its owner (pdf). But it’s not only because the brand owner isn’t using the top level domain.
Online security company Symantec changed its name to NortonLifeLock last year. It then sold its Symantec brand to CA, Inc. CA is a subsidiary of Broadcom. If you visit Symantec.com, you’ll end up on a page on Broadcom’s website, noting that Broadcom now operates Symantec’s enterprise products.
This is the inverse of one of the complaints I hear about dot-brands and new top level domains. Only brands that existed in 2012 have any shot of owning a dot-brand top level domain right now because that’s the lat time companies could apply for top level domains. The adoption of dot-brand domains is stunted without an ongoing way to apply for these domains.