1) Feature gluttony, or adding too many features to a product, can negatively impact the product by increasing complexity, decreasing user happiness as they can't find what they need, and making the backlog and roadmap difficult to manage. 2) Estimates should focus on business value and risk rather than using large estimates to scare customers, as customers don't understand story points and estimates don't necessarily translate to benefits for them. 3) Prioritizing features based on customer needs, automatic testing to reduce uncertainty, and focusing on benefits over estimates can help address issues caused by feature gluttony.