Not delayed AFAIK - just not with "hardened" steel nozzles. They currently have nozzles that are steel and hardened, but not hardened to the level of printing carbon fiber, glass fiber, glow in the dark and other filled materials. ~20HRC vs ~50HRC, where standard brass are ~5HRC.

Personally I'm not doing multicolour and multimaterial with filled materials so not a big deal to me, but it'd be nice to have the option I suppose.

I received my INDX dev kit a few days ago, and I'm currently working through the installation on a Voron 2.4. It's been a lot of fun so far, hopefully using it goes as well. Can't speak for the Prusa side of course but knowing them they have better documentation and support.