I noticed your sig, bios 1604 for the Maximus X Hero? 1401 should be the latest unless I'm missing something.
Of course there is an interest in installing them even if there is no RAID, they get you the latest drivers of your SATA AHCI controller
Install it regardless. There is more going on than raid here. IRST covers the NVME and AHCI controllers and how access, power and tables are written.
I other words I should install both the Samsung NVMe driver and IRST (since it generally provides certain benefits), correct?