Predictability is valuable to the business, but estimates do not give you predictability. What does is a smooth product-development flow, and to get that you need things like measured throughput and cycle time. Those metrics are not estimates. They come from measuring the work as you work. At no point do you need to analyze a specification and make guesses about how long it will take to implement.

Source: x.com/allenholub/status/1819759866686439602