What you're describing is actually not that different from my own conception of what a senior principal SWE is. Simply stated, I would define that level as a very experienced, knowledgeable, competent SWE whose main value to the org isn't in KLOCs they personally write but as a force multiplier who sees around corners (but also writes their fair share of KLOCs).

What turns me off about the version of an L7 SWE as described in the OP's link is the extent to which it doesn't sound like that at all. Maybe it's my bias against BigTech career ladders, but reading between the lines it sounds to me like it's more about navigating organization, political, and bureaucratic obstacles and attending a lot of meetings and generally being seen to be doing these things.

The point of my comment is that perhaps it is rational for an org like Dropbox to value the ability to do that more highly, but I've been in those roles and I found them personally to be soul-crushing.