As one who has had more sets of junk measuring spoons than socks, I can wholeheartedly endorse your recommendations about measuring spoon quality. Your rectangular-ish spice measuring spoons and the odd-sized measuring spoons have been in my arsenal for a decade now, and I have had no problem with them. For "fun" one time I did gather some of my old, cheap (both in price and quality) spoons and cups, and weighed fine salt in them, comparing the weights to your equivalent weight chart. Hardly any of them were able to contain anything near the expected capacity! Some of them now have second lives as scoops in plant fertilizer containers; a couple of the cups live quietly in cat-food bins.
All of that said, when possible (especially when working on a never-before-used recipe or developing my own bread formula), I will use my micro scale to weigh things despite knowing my current spoons always yield the amounts I want. This step allows me to scale my formulae up once I decide to put a new formula into production at our bistro.
As always, your blog posts are informative and authoritative; to say much appreciated is an understatement.

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