In the Estimate Activity Resources, we use the Bottom-up Estimating.
In the Estimate Activity Durations, we use only Analogous Estimating.
In the Estimate Costs, we use both Bottom-up and the Analogous Estimating.

With Bottom-up being more accurate, why would it not be considered in all the processes. Or say both Analogous Estimating as well as Bottom-up Estimating used in all processes and the technique being used as per the needs?