How does the collaborative nature of open design in bitcoin influence innovation and product development in the ecosystem?How does the collaborative nature of open design in bitcoin influence innovation and product development in the ecosystem?

In a very good way. I've seen many apps improving a lot after Bitcoin Design Team step in and helped them.
https://bitcoin.design/
And not only with designing apps, but also with very good documentation.
I myself I wrote some apps documentation, helping them with that. Some devs do not have time for that, so I stepped in (using their github open source repo) and write some documentation.

You do not have to be a coder in order to help the ecosystem. You can help it in many ways.