Question About Email System Direction

[1ubuntuuser]

I'm enhancing the email campaign system to support proper email marketing capabilities. Currently developing this as a separate app to later merge into FCRM.
Need clarification on:

Are Campaigns meant to replace Newsletters? I notice Newsletters seem to get more development attention.
Why do Campaigns only support single recipients? Are Newsletters intended for bulk sending, or is multi-recipient Campaign support planned?

My Current Development (https://github.com/MarqUnity/email_marketing):

• Automatic Leads reference import with "Import Subscribers" action
• Separate email sending for email groups
• Group members reference linked as doc for email template (e.g. {{doc.first_name}} if subscriber import was from FCRM Lead)
• Time-based email scheduling
• Email campaigns can be customised after creation
• Proper unsubscribe handling for email group campaigns

Still pending:

• SMS support
• Filtering email group members

I want to avoid developing conflicting features. Clear direction on Campaigns vs Newsletters would help determine next steps. Also if anyone is currently working on campaigns in general it would be helpful to know what directions they are taking.