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Legend
There's something here. In that fighter hack I posted a few posts back, a couple features are organized around the idea of "forgoing extra attacks" to boost a single attack via damage and debuffs.Called shot - forgo an attack to to inflict a powerful debuff of some kind (stunned, blinded, paralyzed, etc.), maybe tier the debuff or apply incremental debuffs based on a crit.
That framework – seeing the fighter's Extra Attack as a resource (unique from the ways other classes use Extra Attack) – could be a design foundation for higher level combat abilities for the fighter that has built in scaling (due to Extra Attack at 5th, 11th, etc).