Tardy means late chief, not under-explained. The point that I see in that (and what I read into supra-jim's post too) is that recommending either a starter or rehydration is no less complicated a process (or science blinding) than taking a hydrometer reading. Considering most kit instructions suggest sprinkling yeast over the top, you just added on extra technical step that most kk brewers supposedly couldn't grasp.
@ Brewer Pete - there are a thousand things you might do (and I) with your own brews but I wouldn't always recommend them to people just starting out. If I drop a sausage on the floor I might decide to pick it up and eat it but should I recommend that to every sausage dropper? What people did in the past is not always an indicator either. Remember leaches or curing illness by bleeding? Treating psychosis by drowning in a water bath? Some things progress for a reason. Take a hydrometer, learn to use it, make good beer. When you understand the processes and what to look for YOU may decide to dispense with said items. They're not complicated to use though and can actually make simple kk brewing simpler.