I've read on their new road map that the ilcdevteam was focuses more in the development of the DCB . if we look at in the new road map dcb is in development for the next 3 years if i am not mistaken.
You are correct the DCB is a long term process, it is very complex and needs a lot of time for improvements, if we are going to look at the new time line ,we'll see that it's a constant upgrades until year 2024 and would be extended as the demands rises.
yeah that's totally notable since after release, only then that the integration testing is to happen in almost about a year difference. but the good side of it is that the team is not trying to hurry up the development and compromise the end result, rather they focus on the detailed development for each timeline.
That is true,the team had to do it according to the roadmap and taking it as easy as they could just to deliver the best outcome of the DCB.