Independent publishing services should let an author buy the professional work they need without obscuring rights, platform access or third-party costs. The best scope is modular: editorial, design, formatting, publishing setup, distribution guidance and marketing can be selected according to the book.
Keep the service modular
An author with a finished edited manuscript may need design and production but not developmental editing; another book may need the opposite.
Protect long-term control
Make sure you understand who controls ISBN records, retailer accounts, source files, website assets and future revisions.
Separate service from outcome
Professional production and marketing can improve quality and reach, but they do not guarantee reviews, rankings, retailer stocking or sales.