Why should designers focus on showing how they think rather than the teams and processes they worked with?
Because being great at navigating an organization doesn't necessarily mean being great at design. In large companies, shipping anything means surmounting a long list of meetings, processes, collaborations, and sign-offs. That takes so much time and effort that designers start viewing it as their primary job. So when they put together a portfolio, that's what they talk about.
The result? In an hour-long presentation, most of the time goes to organizational challenges and processes, and little is left for design skills. Add in design systems and UI toolkits, and it becomes really hard to know how a designer designs and why. All that cross-team coordination and buy-in certainly shows you can get things done, but it's more a reflection of your ability to operate within an organization than your product design sense. And as we discussed, when AI turns more people into a design team of one, that coordination skill matters a lot less than the design judgment underneath it.
There's an old analogy from Tom Chi I still love. Imagine the Finance team deciding the way to be more strategic is a roadshow about how useful pivot tables are. No one cares. They just want the books balanced. Design works the same way: the results of your work are what demonstrate its value, not how you made the process maps or wireframes. I've seen the "sell the process" approach tried several times. It doesn't change anyone's mind.
So what should you show instead? Go deep on a couple of examples. Walk through the "why" at a big picture level, then the "how" at a detailed level. Why did you pick a specific solution? What iterations got you there? Connect the pixel-level decisions to business, product, and user goals. And make it clear how your unique contributions as a designer, not just as an employee or team member, made the impact you intended.
Put simply, the org chart you worked in won't come with you to the next job. Your thinking will, so that's what to put on the table.