My board two slots PCI-E 5.0 that work as x8 to CPU if both used to x16 if only one used. As well as two PCI-E 5.0 x4 m.2 slots.

To my understanding on a consumer market there isn't much that can utilize that much bandwidth. Current consumer GPUs tap out at 4.0 speeds, but use 5.0 (probably due to "more number more better" marketing). To benefit from 5.0 for NVMe it has to be very specific access patterns.

It's only sad on Intel side because they want strong market segmentation and got away with it because AMD wasn't a competitor for years.