NVME is missing support for mandatory features through "Get/Set Feature" command

The following are features which are marked as mandatory by the 1.2 specification (NVMe 1.2, Section 5.14.1, Figure 108) as currently not implemented
 - 0x1 Arbitration
 - 0x2 Power Management
 - 0x4 Temperature Threshold
 - 0x5 Error Recovery
 - 0x6 Interrupt Coalescing
 - 0x7 Interrupt Vector Configuration
 - 0x8 Write Atomicity Normal
 - 0x9 Asynchronous Event Configuration