Need for a tool for writing proposals and specs?

I regularly write proposals and specification sheets for potential new projects. Currently I use my own set of WordPress templates to streamline and simplify this process. I've drawn up a simple example of how these documents look like here:

https://bjoernkw.com/2020/01/04/example-proposal-pet-clinic-management/

While this works quite well for me, time and again I've been thinking about turning this into a product that further automates the process of creating, sending and gathering feedback on this kind of business communication. It'd allow me to compose a proposal from existing templates and snippets within a specific UI, rather than with a generic WYSIWYG / text editor. It would also have comment, follow-up and to-do features in order to stay in touch with the client.

Such a product would be quite similar to Recapped ( https://www.recapped.io/ ) but targeted specifically at IT consultants, freelance software engineers and small software development agencies.

My questions to other consultants and freelance software engineers are: Would such a product be useful to you? Would you consider using such a product instead of simple Google Docs / Microsoft Office / LibreOffice templates?

(The diagrams in the example have been created with Gliffy. Diagramming wouldn't be part of the proposed product.)