[andreigheorghe]

You expect a (good) product manager to be reasonably technically competent so that they can carry a conversation with business/customers without having to go back to engineering every time to ask "Is this possible?".

Similarly, you can expect a software engineer to be somewhat product competent so they can push back on bad ideas, proactively suggest better ways of doing things, and even connect the business dots and propose entire classes of new features that the PM maybe didn't even realise were possible / within reach.

It's not two roles in one, it's not working 16 hours / day, it's just having the right mix of experience and intuition such that you're still primarily an engineer but you help guide the product.