You write very well. The competency matrix is a great framework and may actually help more entities than your company if adopted by most people in the same environment. This is not just for startups only.
Your point on it becoming a benchmark for competency goals makes it much more powerful than you can imagine. I will be adopting similar competency matrices for product management and even in the investment space. Maybe I should write a similar post on my experiences while referring to this.
I would encourage people to write more on local frameworks that they have tweaked and adapted, this is how we build what really works for us and not what we think may work for us. This is how we document our progress as an ecosystem.
Thanks again for sharing so much.