Thanks, finally I grasped it! =) Maybe it might be wise to edit the follwoing paragraph in a way that it better reflects the situation, to prevent further misconceptions by other members:
I think this is the key paragraph for getting a grasp of the whole situation. After reading the text in this revision, the common user might get the impression that updating the RAID ROM (to match the driver version) is essential, even if only AHCI is being used. Or at least the paragraph doesn’t exclude the possibility that it might be so.
A reader will probably feel better with a definitive statement that AHCI users do not need to update the RAID ROM module to use the latest IRST drivers, and version numbers dont need to match (and maybe a reference to the chart in Which are the "best" Intel AHCI/RAID drivers? for the recommendations for their individual controller instead). Also statements like Best matching Intel RAID ROM: v10.1.0.1008 under every download might be misleading to the user. Maybe a note at the very top might say something like: "NOTE: Machting RAID ROMs to specific IRST releases is only relevant when the system is being used in RAID Mode".
Just my opinion of course! Again big kudos for writing and maintaining such a huge amount of guides and knowledge with incredible attention to detail, and making it available for the community! Great job!