And back when PCs were far more open, good old IDE was always an option too.
Ever since BIOS became EFI, and flash ROMs started getting much bigger, it seems they've not been adding functionality but removing it slowly. The excuse is often "security" (against the user), and "legacy" (the oldest interfaces are also the most widely understood and stable).
That said, I'd stay away from the "prebuilt" manufacturers like Dell, Lenovo, HP, etc. if you want configurability. They've always had far less options in their BIOS than equivalent offerings from "enthusiast" or "gamer" oriented companies, although in the laptop space it's more difficult to do that.