What do you like? I'm setting up an older Intel server for training purposes, but it lost RHEL support at version 6. That said, everything still works with the RHEL 8 installer, except it won't create a boot drive. I'm debating between just booting from a USB drive, or turn off the integrated SATA controller and plugging in a new card that RHEL 8 would like. RAID isn't a concern, but I wouldn't throw it out. Are you using a card with RHEL 8 that you've been impressed with?

And I'm using RHEL 8 under a developer account.

What SATA controller support has been removed?

I'm not saying that it has been removed. A driver is still there, else I wouldn't see the drives. The OS does install on the drive as well, BUT the installer will not establish a boot drive. I have reloaded at least a half-dozen times with various BIOS settings and even a different drive.
According to lscpi, on board it has:
I'm guessing that the driver being used now is just different enough from RHEL 6 that it can't set up the boot. I know that I could probably get this working manually, but I'm trying to keep this a KISS installation process. And frankly, I'm tiring of fighting with it, so I've ordered a PCIe SATA controller that claims full compatibility with RHEL 8, including being able to provide a boot drive. I will know tomorrow if that is true!