ELI5 what is the difference between UEFI handles passed to grub by a proprietary bootloader versus coreboot?
ELI5 what is the difference between UEFI handles passed to grub by a proprietary bootloader versus coreboot?
What are the broader implications when it comes to access, security, vulnerabilities, etc?
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coreboot isn't a UEFI implementation. It is comparable to the UEFI SEC+PEI phases. It then hands off control to a payload. If you want UEFI, that's going to still be edk2.
What is a typical real world application for tianocore/edk2? Like who is using this and where/why? Like is this for custom hardware projects, servers, hardware hackers, OEMs?
All UEFI system firmware uses edk2. It's not just the reference implementation; Pragmatically, it's the only implementation. Independent BIOS vendors (IBVs) like AMI, Phoenix, and Insyde have built all their tooling for and around edk2. Companies like System76 and Purism use it as a UEFI payload for their coreboot based firmware.