PC enthusiasts used to use multiple cards in SLI or CrossFire configurations to get the best performance in games a few years ago. As a result, AAA titles are becoming more frequently incompatible with multi-GPU systems since developers no longer bother to make changes to the engine and API for such a niche user base. All games that support DirectX Raytracing (DXR) fall into this category.
There are, therefore, very few next-generation GPUs that support daisy-chaining two cards. For studio applications, the RTX 3090 from NVIDIA is the only Ampere GPU with NVLink support. AMD has completely removed support for CrossFire on its Navi cards.