I think for most people they won’t care either way.
Some people do legitimately occasionally need to poke around in GRUB before loading the kernel.
Setting up certain kernel parameters or looking for something on the filesystem or something like that.
For those people, booting directly into the kernel means your ability to “poke around” is now limited by how nice your motherboard’s firmware is.
But even for those people, they should always at least have the option of setting up a 2-stage boot.
I think for most people they won’t care either way.
Some people do legitimately occasionally need to poke around in GRUB before loading the kernel. Setting up certain kernel parameters or looking for something on the filesystem or something like that. For those people, booting directly into the kernel means your ability to “poke around” is now limited by how nice your motherboard’s firmware is. But even for those people, they should always at least have the option of setting up a 2-stage boot.