Very simple - I'm just not very interested in making patches with Axoloti. Tried it before and didn't enjoy the process too much.
If I wanted to use Axoloti environment, I'd consider converting it into eurorack module, it's much easier to do that compared to porting firmware to a new device. Especially with Akso. But we don't have an official device with MCU that fast for OWL in official devices yet (up to x4 faster compared to current OWL2 board), that's why I'm experimenting with other hardware for now.
As for PD patches - I thought that it's half broken and generally use C++ or Faust. However, after checking out Fascination Machine patches shared here in web patcher, I've changed my opinion. PD can give pretty impressive results too in the right hands.