Full sized cameras do use a buffer to deal with burst activity, take series if shots - process - save to slower storage. Also, modern cameras start switching to CFexpress/SDExpress (which are NVMe)
> Version 8.0 was announced on 19 May 2020, with support for two PCIe lanes with an additional row of contacts and PCIe 4.0 transfer rates, for a maximum bandwidth of 3,938 MB/s
Full sized cameras do use a buffer to deal with burst activity, take series if shots - process - save to slower storage. Also, modern cameras start switching to CFexpress/SDExpress (which are NVMe)
> Version 8.0 was announced on 19 May 2020, with support for two PCIe lanes with an additional row of contacts and PCIe 4.0 transfer rates, for a maximum bandwidth of 3,938 MB/s