As slapout noted, the WW II Commandos were organized that way; the 1st Special Service Force effectively operated that way, USSF and SOF essentially operate that way and as you point out, the structural design is essentially a bookkeeping measure and units in combat have always organized anyway they wish to accomplish the mission.
That is likely to continue to be true and it works; why waste a lot of effort trying to create the 'Optimum' organization when, as soon as its committed, someone not privy to the design rationale will modify the organization to suit his mission?
I have not seen every conceivable ad hoc organization of Army and Marine Scout and Rifle Platoons but I have seen hundreds of variations employed in combat. Most all of 'em worked.
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