Interesting. I had a very good audio guy tell me years ago how the DI’s in many bass amps could be unreliable. Since then I’ve just used an outboard DI of my own. It makes the good audio techs happy and you can show the hand to the clowns with that gaff tape wrapped circa 1992 Whirlwind.Those Elf combos do look interesting! I noticed in the video he talked about designing the DI so it wouldn’t cause hum in the PA - I’ve had that problem with the DI out on my Markbass.
Talking maxim schleppability though it’s kind of essential the DI on an am be minimum pro quality like a Countyman or JDI.