Secure Boot itself is fine, the problem is shipping ANY keys by default. I use Secure Boot myself with my own signed keys on my laptop and its nice knowning it can only run what I allow it to run (password protected UEFI ensures only EFI binaries or kernels I signed get booted and that ensure it mounts my encrypted partitions).

The problem is when these other keys are pre-shipped they invalidate the entire "ensures only [...] kernels I signed" part. And just removing the pre-shipped keys can cause other problems: https://github.com/Foxboron/sbctl/wiki/FAQ#option-rom