Whenever a Summarize tool is used, it renames the output field (e.g., sales becomes SUM_sales or AVG_sales).
I think a reasonable compromise is to by default not rename fields in the Summarize Tool, but to include an option (in the tool, or in global settings) to allow for renaming.
I have yet to come across a use case where automatic renaming of aggregated fields is desirable. What I have come across is the annoyance to rename the fields back to what they were with a Dynamic Rename tool, and sometimes having to do this multiple times (e.g., converting back a SUM_SUM_SUM_sales back to sales). Additionally, automatic field renaming causes workflow errors when workflows are later modified by adding/removing a Summarize tool (e.g., if you later add a Summarize tool, all downstream steps will expect the "sales" field and not know to use the "Sum_sales field).
Automatic Renaming feels very much like historic Excel with Pivot Tables field renaming and not reflective of modern code-based workflow best practices.
I appreciate you considering this improvement.