> Having "analytics disabled" correlate with "using that specific feature" is always a major problem for data driven decisions, worse it's a well hidden and hard to estimate problem.

It's a bit worse than even this suggests. Using any feature is correlated with having analytics disabled, because the more of a power user someone is, the more they'll use "advanced" features (anything beyond "clicking in the URL bar and typing a search term"), and obviously power users are the only people disabling analytics.

So if anything there's an all-encompassing metrics bias saying "users want fewer features and less complexity".