I'm pretty sure it's a cultural thing within CASA.
Every time a senior position opens up, people apply. When interviewed they are asked 'what can you bring to CASA? How can you make things better?'.
This encourages 'change'. The issue is that, in reality, there are only a handfull of possible solutions for any given scenario, therefore the wheel keeps being reinvented.
In one or two iterations of DAS at CASA, we'll be back to a great, wonderful new system of MBZ's...