I'm working with embedded on a similar industry, and also really enjoy web dev. I don't like the tools and edit-compile-cycle when working with small microcontrollers...
The "closed by default" attitude drove me nuts. Teams develop tools to improve their work and refuse to share the source code, even internally, even when there is a business reason (I'll improve the tool for you and me). Forget about cross-company collaboration on open source like you see in web dev.
May I ask why you left the industry?