I think your comments are sound.
My .04$ (inflation) is twofold:
1) Break-in does not mean baby it. Of course first warm the engine up to operating temps, but getting on it pretty good, once warm, will harm nothing and indeed will help prevent cylinder glazing.
2) On 2 strokes - I don't understand the 20:1 for break-in and then changing to 50:1 (or whatever) either. There really isn't a need for such an oil rich mix - especially with the good oils. You'll just have oil drool, chances of fouling plugs, gumming the rings, etc. I suppose a little oil rich (30:1) might help with the wear materials in a lower quality engine. I've broken plenty of 2 strokes in at 50:1, 80:1, 100:1.