It’s not “some maintainers”. Let’s be honest. It’s one particular maintainer.
I am restraining myself here to stay within the Etiquette Guidelines, but I believe it would be clearly better for osm-carto in particular, and OSM in general, if that maintainer were to step down from osm-carto and focus his considerable talents and energies elsewhere. Speaking from experience, one of the most valuable skills in OSM is knowing when to stop and let others take a turn.