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.