This is definitely a needed one

Yes please! A proposal/estimate signed trigger would be very helpful.

Also, a filter on the Customer Replied trigger (in a particular Workflow, to a particular Opportunity Name) for negative intent/positive intent/more info.

The filter by Opportunity Name should also apply to the Proposal/Estimate Signed trigger.

How is it the system will mark a proposal as Sent but we can get this info from API

There are over 300 votes scattered into different categories for a signed trigger in worflows

please create a trigger for proposal sent and proposal signed or approved

Yess also need be able to send an autofillable proposal or estimate automatically template to client

Yes, absolutely! Love the new estimates and proposals ... but let's get automations that can convert completed documents into invoices, trigger for automations etc...

I'd also want the option for an automation triggered by some other customer behavior (survey submission etc...) to then be able to have a workflow step that sends a proposal or an estimate, among other things in a workflow sequence.

Yes the integration of Proposal and Estimates is great but integrate with workflows is a must have.