The deeper problem is that Carto gets a free ride on the website as the incumbent house style. You can fork it, but doesn't make it the default style shown on openstreetmap.org. You could fork it, get popular community support, and still get nowhere except for wasting a lot of effort, because displacing Carto takes a lot of political manoeuvring as well as server resources for hosting the default style (which are not insignificant).
If it was a matter of just forking it, and have the openstreetmap.org website maintainer pick it up if it proved more popular than that would be that, but given the fact that the one other Carto maintainer who seems semi-active is also a member of the OpenStreetMap operations working group (i.e., server resources), spending any effort on a fork with the goal to displace Carto seems pointless at this point in time. I prefer to spend my resources on just making the map better.
Some people justly pick up their crayons and go make a nice thing elsewhere (like the Americana style), or contribute to the styles used by popular apps. For now part of the community just gave up on Carto and is waiting to see how developments for the new vector style will pan out.
openstreetmap-website: https://github.com/openstreetmap/openstreetmap-website/commi... . Numerous commits most days.
openstreetmap-carto: https://github.com/gravitystorm/openstreetmap-carto/commits . So far in 2024; one small regression fixed, one niche bit of tagging added to an existing style, some largely pointless code style tidying. That's it.
Elsewhere in the comments it was pointed out about hostility to experimentation, the same applies to openstreetmap-website. There are many things that could be tried on the front-end, but in the eyes of TomH you need to be perfect at the first shot, based on his understanding of the situation.
Somebody pointed out that openstreetmap-website contributions pace curiously picked up after the NorthCrab's blogs detailing his unofficial and unsolicited Python rewrite, OpenStreetMap NG. Honestly even if he's somewhat cringe at times, he's still more adaptive than TomH and co. E.g. people pointed out that Mongo is fauxpen source so he duly rewrote the DB part in Postgres.
A similar situation holds with openstreetmap-website. Sadly currently barely anyone uses Rails...