This is not rejuvenation, just as adding a new coat of paint to an early-Victorian mansion doesn’t make it any younger.

If adding GraphQL helps make WordPress more palatable to clients then knock yourself out.

There is still plenty of tread on the tires for WordPress. It's cheap (free), easy to deploy, infinitely customizable and extensible, and has a monsterous userbase. I still have yet to see any CMS software come close, not even Ghost.

Oh yeah, I don’t see that Victorian house going anywhere either.

It’s very easy to make a CMS with a more elegant & higher-quality codebase, but it’s very hard to create a CMS with better features, and impossible at this point to create a CMS with a larger ecosystem.

Interesting narrative from a database schema to GraphQL schema.

1 typo noted: but nevertheless thay are a distinct entity.