Inconsistency in API and Email Subject Formula

Web Form 

In our travel form we use a formula to pull information from the form to act as the email subject.  
I find the inconsistent use of underscores.
The information being pulled from the form is from the Web Form Field API reference name and that information does not allow spaces:
Travel Start Date
API reference Travel_Start_Date

there are underscores in place of the spaces for the API reference

When you use the information in the formula, the underscores need to be removed:
[[ECF:Travel Start Date]]

When the email comes from Docusign there are underscores where the spaces used to be. 
Email subject 2026/05/14_Initiator_Firstname_Lastname_Travel_Destination_Name

I’m not sure where this development evolved but the inconsistencies of underscore for spaces versus spaces and no underscores for the formula to work in my mind is counter intuitive.  Underscores should be used in all cases and consistent across the platform.

Thank you for reading my venting on this issue. I’ve had to reformulate so many times and this inconsistency has caused me many hours of lost work.