The other an automated set of standard pre-built bisection points so
that testers can more easily localize a bug down to a few hundred
commits without needing to learn how to use "git bisect" (think Ubuntu
users).

Before that you want a flowchart or instruction list of boot options to
try. A lot of errors can be localised simply by asking the reported to
boot with things like "iommu=off", "pci=routeirq", "apci=off" etc

That takes a lot less time to run through and can be very informative.

Alan