Thanks for checking out my presentation.
Regardless of which quadrant you see yourself/your company in, I'd say that good product marketing managers (PMMs) are usually part data scientist, part competitive analyst, and part storyteller. But the core part of their make-up is them being highly empathetic and great problem-solvers. Of course, it doesn’t hurt to know a thing or two about product design and user experience — all the better to help you collaborate well with the product manager who’s actually spearheading the build-out. Understanding business strategy is a boon too since all that research gathered by a PMM could have larger strategic applications for a company (sometimes, at a later stage).
In my experience, which 'muscles' (or traits or skills) I end up flexing depends a lot more on the 'job to be done' and a given project team's composition and strengths, rather than the size and scale of the company or product portfolio.
I've found myself in the top left quadrant a few times and usually, a product marketer in that space tends to be more heavily focused on things like cross-team knowledge transfer, go-to-market, and communication support.
In one particular instance, however, I found myself in a situation where the product manager had decided to quit halfway through the project. I ended up having to cover his role temporarily to get the product launched as per the schedule. In this particular case, the broad traits/skills that got me through the situation were (1) empathy & the ability to connect with stakeholders on different levels; (2) creativity & problem-solving; and (3) strategic planning & business skills.
I'm sure the 'unfortunate situation' that I described above isn't unique to any specific quadrant. People can quit and leave teams and companies at any time and I think the three skills that I'd called out above would serve useful, regardless of whichever quadrant you identify yourself/your company in.