tbh I see just as much notebook-hell outside of dbx, it's certainly not contained to just them. There's some folks doing good SDLC with Spark jobs in java/scala, but I've never found it to be overly common, I see "dump it on the shared drive" equally as much lol. IME data has always been a bit behind in this area

personally you couldn't pay me to run Spark myself these days (and I used to work for the biggest Hadoop vendor in the mid 2010s doing a lot of Spark!)