writing code != building things.
In my org, seniors spend a lot less time building things: writing components, etc. They do spend a lot of time navigating office politics. But they are engineering specific office politics: how does system A interact with system B? What are the architectural implications? Ownership of long term data and technical and business strategies?
The "art" of negotiation can be ass-kissing but quite often genuinely with the goal to advance the projects they own and the enablement of the "people who actually build things", which at some point also involves the seniors. You need to build raport and relationships to negotiate seriously.