Finally got around to reading this thread, never realized how great it would turn out to be.
Kelvin being more precise than Celsius is just gold Jerry, gold!
Also, not sure how old you are Wombat (I'm in my 40's), but plenty of my aeronautical engineering problems in college were in imperial units. A good number were metric too, but like any engineering student knows it didn't really matter until you got to the end and you converted to whatever system they wanted the answer in. I can't visualize the number of slugs per square foot any better than I can kgs per square meter, or Newtons vs. lbf, etc. so who cares? It's all just carrying your units through until the end, nothing more.
As my high school physics teacher used to say when you gave a number only answer like "27", "27 what, mops?!"