I've been setting up a tiny service business that runs entirely by email: fixed scope, fixed price, no discovery calls. Early notes, since it's a model a lot of solo builders could use: 1. Productize
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Charlie from xSquads
Your first point is the one most service businesses miss. "Website help" sells nothing because the buyer cannot picture what arrives, while "20 researched companies, each fact with a source link" can be judged before any money moves.
I would add one line to the scope email: how the buyer will check it is done. "You'll get X, by Y, not including Z" covers the deliverable, and a sentence such as "each company will have a working source link you can click" gives both sides the same test at handover.
On buyers who insist on a call, I have seen it work to offer a short call only after they reply to the written scope. By then the call is about a real document instead of discovery from zero, and it usually takes ten minutes. Some buyers simply trust a voice more than text, and that is fine as long as the agreement still lives in writing.
How often do written enquiries turn into paid jobs for you so far?
Another thing that helps with buyers who insist on a call: put a "what I need from you" checklist at the end of your scope email, three or four short questions they can answer in two lines each (goal, deadline, who approves, anything off-limits). Most people who want a call really just want reassurance that you understood them, and answers to those questions give that in writing.
If they still want to talk, offer one 15-minute slot after they reply, and send a recap email within an hour: "Here's what we agreed: X, by Y, for Z." Ask them to reply "confirmed" before any money moves. That way the call never replaces the written record.
For your 5th point, a simple rule is that anything which promises a price, date or refund gets human sign-off, while FAQs and status updates can go out as drafts you skim quickly.