I have worked with an engineer who spec medium size plates for all struck block jobs. This makes good sense do to the fact even the best masons can't make all cuts that tight.
As far as 314.21, I brought this up in the BC area questioning why this is not in 314.20. It seems we could toss out 314.21 if it were.
The UL orange book states any box in a rated wall will not have more than an 1/8" gap therfore overridding the NEC laxness. (is that a word )
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