So there's NVENC H264 ABR preset and NVENC HEVC ABR preset. I do not use them because ABR in Kdenlive does not allow me to modify quality settings. As the result, the video is a blocky blurry mess after rendering.
However, NVENC H264 VBR does allow me to choose quality, so I use it for rendering. But my GPU also supports HEVC. There is NVENC AV1 VBR... But my GPU does not support AV1. And there's no NVENC H265 VBR. Why isn't it there?