I think there is a dissonance between smart personalized suggestion and being against tracking.

Which is the main downfall of DuckDuckGo they use as the smart bar search engine.

If you want good suggestions and smart personalization you need to track your user.

If you don't want to track your user for privacy concern, it's all good but then don't give user a product like suggestions that will always be subpar compared to someone else that is for user tracking.