Honestly, if most "advanced" users turn off the features that Google uses to gather data to improve UX, it's strong signal UX isn't important enough to "advanced" users for Google to optimize for it.
It doesn't matter if .1% of users turn off their telemetry, their use case wasn't going to be optimized for either way. In fact the Google employees themselves are part of that .1%, they don't need the data to tell them what's important to advanced users.
Automatic metrics are only one tool in a toolbox that includes focus testing and design aesthetic.
But if a whole subset of users exclude themselves from that tool, they're going to get the UX that's only as good as the other tools in the toolbox are capable of building.
Missing data leaves its own wake. Google has numbers to extrapolate how many turn off usage reporting. They lack automated signal in how the users use the tools.