The tracking bottleneck
The tracking bottleneck is the point where conversion signal quality caps everything downstream: bidding, attribution, and MMM can't be better than the data they're fed.

The tracking bottleneck is the point in a marketing stack where conversion signal quality caps everything downstream. Smart Bidding, Advantage+, attribution models, and marketing mix models cannot be better than the conversion data they are fed. So broken, duplicated, late, or value-less signals limit results no matter how sophisticated the layers above them are.
#The bottleneck moves the problem upstream of strategy
Most optimization advice assumes the inputs are fine and argues about the layers on top: which bid strategy, which attribution model, which creative framework. The tracking bottleneck says the ceiling is usually lower down. A platform optimizing toward bad conversions doesn't just mis-report. It mis-spends, because every automated bid is a decision made on that data. That is why fixing Signal quality outranks switching bid strategies: widening any other part of the pipe does nothing while the bottleneck holds.
This is the problem Buron works on continuously: health checks on the conversion signal, so a defect becomes a finding before it becomes spend.
For the full argument (the four signal defects and how to fix each one), read The tracking bottleneck: your bids are only as good as your signal.
Related terms
Signal quality
Signal quality is the fitness of your conversion data as an input to automated bidding: complete, deduplicated, on time, and carrying real values.
Smart Bidding
Smart Bidding is Google Ads' auction-time automated bidding (Target CPA, Target ROAS, Maximize conversions, Maximize conversion value), setting a bid per auction from the conversion data you feed it.