Vorker handles the admin around your design work: scoped proposals with revision limits, invoices, case-study posts and polite payment chasers. You approve everything.

No. Every proposal, invoice, post and chaser is drafted and then waits for you. You can read it, edit it, reject it, or approve it. Nothing outbound moves on its own.
Solo designers get the most out of it, because there is nobody else to hand the admin to. Vorker is built for practices of one to five people, not for agencies with a studio manager.
It drafts from your rates and how you scoped similar projects before, including the revision limits, and it gets closer the more you use it. Treat the first draft as a starting point you adjust.
No. It is a short, warm nudge in your own voice, drafted when the due date passes, and it waits for your approval like everything else. You will never send it angry at midnight, which is rather the point.
They are drafted from how you write, with your photos, and nothing is published until you approve. Most designers edit the first few and then find the drafts need less and less.
No. You type or say it, the way you would tell a studio manager, and it works inside your email, files and accounting. Proposals and invoices arrive as ordinary PDFs on your paper.