It also splits memory duties between a CFexpress and an SD card, as opposed to twin CFexpress, which means only one slot will achieve full firepower. The flipside to these advanced features is that it only has a 24.1MP sensor (though some pros I've spoken to feel that this is actually a benefit, since workflow speed can be more important than resolution).
On top of that, I love the benefits of Canon's industry-leading autofocus performance, industry-best 8 stops of compensation (lens dependent) thanks to its in-body image stabilization system, and one of my personal favorite things is that the R3 is the only mirrorless flagship with a fully articulating touchscreen – which is important for taking full advantage of the video capabilities (in this case 6K RAW). The Canon EOS R3 is the manufacturer's de facto flagship camera, offering 6K RAW video, 30fps continuous shooting (RAW and JPEG), and remarkable Eye Control AF – which enables you to move focus points simply by looking at your subject (and yes, it really does work – even as someone who wears glasses!).