"Help me out here. What am I missing?"

I thought you were missing State info for efiling amended returns.

"Are you replying to the right post?"

You are a Lacerte user, right? That link is to the Lacerte topic for which States Lacerte allows for efiling new for 2020.

You specifically titled this topic as: "I know only a handful of states offer amended tax return e-file compatibility."

In addition to what is listed for 2019, here:

https://proconnect.intuit.com/community/update-products/help/2019-lacerte-e-file-agency-approval-and...

You see 6 more have been added for 2020 (in addition to CA, GA, NJ, NY, NY city, VA and WI = 6 states as of 2019), because I posted it here. That makes 12.

"Are other states moving to accept amended e-filed returns quickly?"

As a Lacerte user, you would first need Lacerte to manage the action of handing off your transmissions. That's why, at least to me, the list regarding what Lacerte manages would be the place to start.

"Most of my clients are in a state that does not offer amended return e-file"

We can help you with the resources for the software in use, which is the function that you would be using to do what you asked. Or, did you want to know All States that allow for efiling amended returns, even if Lacerte doesn't provide for it?

You further asked: "I was just curious if anyone knew what the consensus among the other states was regarding adoption of this process"

You just asked Peer Users, who would likely not be in the know for what each of these other States' DOR is planning. Did you need 38 more answers?

And of course, there is a differentiation between individual, corporate, etc. That's a pretty big matrix to research.