That’s not true at all. That has been true only for the embedded and mobile space. The server space is exactly being made open and compatible between SoCs (in

That’s not true at all. That has been true only for the embedded and mobile space. The server space is exactly being made open and compatible between SoCs (in the same way AMD and Intel machines are). Platform crud (i2c, gpio, i2c, clock trees and pinnmuxes) is hidden in firmware behind ACPI, PSCI and UEFI just like on x86. SBSA and SBBR specs mandate stringent compatibility requirements. Machine error handling is firmware-first. IO is basically PCIe now. For an OS vendor or an IT guy these machines look almost exactly like an x86 box. And then they look the same between the Arm vendors too.