Yeah, good call, we're on the same page about that. I designed this tool (agentreadingtest.com) to raise awareness of these issues in a more general way, so people can point agents at it and see how it performs for them. Separately, I maintain a related tool that can actually assess these issues in documentation sites: https://afdocs.dev/

My weighting system there scores the number of pages affected by SPA and caps the possible score at a "D" or "F" depending on the proportion of pages affected: https://afdocs.dev/interaction-diagnostics.html#spa-shells-i...

I've tried to weight things appropriately in assessing actual sites, but for the test here, I more wanted to just let people see for themselves what types of failures can occur.