Let me see if I follow correctly the pattern of this thread:
1) Your initial post laments that none of "the big 3" make a 13-26 10 speed or 13-30 11 speed to give you ideal gearing with your standard crank big ring.
2) You get told a compact crank with a 50 ring is the same. You ignore it.
3) You get told twice that Shimano makes junior 13-25 cassettes. You say nothing until it gets repeated.
4) You get told Campagnolo makes 13-29 cassettes, and say nothing.
5) You finally say that specifically you want SRAM to make your specific style cassette with a 13. Which was your whole point from the get go.
6) You then argue about redundant solutions being okay. So the dire problem of your OP has been solved multiple ways before you posted, but not the solution you wanted.
The only movement that this thread should inspire is one of the bowel.