it's open source you could just fork it and make a version without react. I think it sounds a bit entitled to ask for people to remove things like react from their projects.
We definitely find a lot of value in being able to make references to pieces of configuration that can then be used throughout the app. Then you can change something in one place, and it is consistent everywhere.
It also doesn't require actually building the app, the user can just tell you which action they take and you draw the next app state on a piece of paper
I was using Intercom but It got really expensive. Its the best product for emails for products but they are positioning themselves for enterprise nowadays.
Because of the price I have decided to create my own email flows provider. It works like a charm because I adjusted it to my needs.
If you are still looking there it is: undersend.com
Please remove react so more people could use it :)