Can't answer that tbh, but really, W3C is nearly irrelevant today and lives on only in the minds of people who have this idea that so-called web standards are created by W3C. W3C is into CSS still (on life support, and arguably, to avoid the bad looks of a single "browser vendor" dominating the show). But eg W3C's last involvement with HTML was three years ago [1], and their last HTML recommendation was based on WHATWG HTML snapshot January, 2020 [2]. You can check the barren place that is W3C's site yourself. I wouldn't put forth W3C as a shining example of standardization, to say the least, given the state of the web and browser diversity.
Also, you've got to understand that ISO is a complicated association of national "standard bodies" of varying legal statue, held together by international treaties. Nothing is easy and quick in that kind of environment; it's a miracle that it can produce something at all in this day and age. A way of motivating domain experts to become standard editors in the past has been to sell the standard text at high enough prices, such that the editor's own privately published book (containing a commented version of the standard text) would sell better.
Now whether the world needs another graph query language I'm not sure tbh. Certainly, I thought that creating a standard from scratch by committee was deemed less desired when Prolog (and Datalog) exist, as ISO standards even. W3C had put a lot of effort into RDF/SPARQL, and TBL' involvement with graph knowledge bases predates even WWW [3].
[1]: https://github.com/w3c/htmlwg
[2]: https://sgmljs.net/docs/html200129.html and https://sgmljs.net/docs/html230116.html
[3]: https://en.m.wikipedia.org/wiki/ENQUIRE