Ah, we misuntersdood each other yesterday on Twitter.
The purpose of the getting started guide is to cover the full stack superficially, to give a bird’s eye to a newcomer. Covering the full stack in more depth is the purpose of the guides as a whole. I don’t see another guide in between.
I’ve checked the testing guide and albeit it is marked as WIP looks like it is in a pretty good shape. I’ll review it and perhaps add a little section on fixture maintenance, and good to go.