You're right, I forgot edge got theirs released last year. I did read one of Banks FB posts where they admitted their cummins tuner was going to be totally redesigned because it was more complicated than previous tuners.@g00fy Banks has been working on the Derringer tuner for the Cummins since as long as I can recall, easily since 2019. I don't know how on earth Banks would struggle to get something EPA approved if somehow Edge, Stealth, and others can get box tuners, and companies like PPEI, Hardway, and Calibrated Power can all release tunes.
This likely comes down to the fact that it's not a huge priority for them, and it's more tricky than they initially expected, or requires more params then what they currently have access to via the piggyback. They have to tread a fine line between cost, performance and complexity of install, which is tricky if you've got to instal half a dozen sensors and plugs when a tuner requires you just flash the ECM/TCM via the OBD.
I've got less than a year left on my powertrain warranty, so I gotta start saving up, got a small list of preventative maintenance mods I want to do, Grid heater Delete, Billet Valve body, and I guess a proper tune since even if the derringer does come out between now and then I might as well wait and do it right.