For copyright purposes, all patches must be substantially human-written. However, it seems that most patches are now prepared with chatbot assistance, so that effectively means that people are required to be psychotic centaurs in order to keep up with review demand. There's an LWN secret link from the documentation lieutenant which summarizes the linked LKML thread. My former lieutenant, in the Direct Rendering Manager (DRM) subsystem, is apparently having a bad time:

Airlie asked his sub-maintainers; most of them identified him as the biggest pain point. More seriously, it was that the DRM subsystem is still seeing too many regressions. There is a push within the subsystem to move development to GitLab in order to use its CI features; he is not standing in the way because he wants to see how it turns out.

This is a more systemic problem than one might expect, because DRM (and DRI, Direct Rendering Infrastructure) are partially shared between Linux and the BSDs. This subsystem has creaked along under the weight of corporate expectations for decades, mostly fueled by a kind of quiet sponsorship of young university folks from GPU vendors along with outsourced drivers produced behind corporate privacy and thrown over the wall. Every vendor, even our eternal nemesis nVidia, has made repeated concessions in order to try to figure out the maintainer burden, but it seems that we are still dependent on Airlie's stoutness and willingness to get shouted at by Torvalds.