you are defining the art of setting up SLOs for end user workflows. This is typically achieved with contract monitoring (top down). This article is focused on bottom up approach of fine tuning and setting up alerts
My point, I think, is still that the overwhelming focus of the tools I've seen focus on the kind of fine-tuning/setup you are describing and not the things that I find most valuable. And I think that part of the problem is that it's easy to build technology around mechanics than judgement.