Hi Justin,

First of all, thank you so much for giving this plugin a try and covering it at Wp Tavern.

https://github.com/munirkamal/gutenberg-forms
Btw, this is an opensource project so if anyone is willing to contribute that would be much appreciated. 😇

You put it very fairly that this is a new plugin and requires feedback to improve step-by-step. I have been gathering feedback lately from a very short number of users via the GitHub and WP plugin support forum and have been refining the plugin accordingly. Now as you cover it at the mighty Wp Tavern, I expect to get more feedback to proceed in the right direction to shape this plugin further.

Addressing your highlighted problems/issues:

Forms CPT is limited to only form fields?
Well, this might be a little confusion I understand. I am using a template lock on this CPT to make sure it remains a form block mainly. But, you can insert other Gutenberg blocks inside the form blocks here as well.
https://share.getcloudapp.com/NQugDmjB
Shortcode Approach.
I mainly added a shortcode approach to extend the form usage outside the Gutenberg editor. So users can actually create forms using Gutenberg editor via the Forms screen and then use it anywhere using the shortcode. This is why I mainly added the shortcode functionality. And, for the time being I've utilized the same approach to insert saved forms in Gutenberg as well. But, you are right in saying this should not be this way for Gutenberg and I am going to improve it for sure.
Broken Form Templates
Yeah, I am aware of this as well. Basically most templates were created with an earlier version of the plugin and thus I need to update those using the latest version. This is a quick fix and I will do it asap. And yes I plan to keep adding more ready to use form templates.

Overall you are correct about the quirks and nitpicks that are currently there, and I am definitely going to improve it in the next updates.

Features Highlights of Gutenberg Form:

I would like to highlight the features here for your readers and those who wish to try the plugin. I know the documentation is missing and I am working on it. But here are a few things you need to try.

Multi-Step Forms:
This is super easier to create a multi-step / multi-page form using Gutenberg Forms plugin. You are flexible to create any number of steps and also with the next/previous and submit button placement.
https://share.getcloudapp.com/4gujyEA4
Conditional Logic:
This a nifty feature to show/hide fields based on the value of another field. You can also apply it on the Form Group block and this way you can toggle a group of fields easily.
https://share.getcloudapp.com/2Nu5XDk4
Email Editor:
You can define your desired fields to send out to the email notification. Further, you can also provide "To", "From", "CC", "BCC". Or you can completely disable the email notification via the "Form Actions" settings for any specific form you are working on.
https://share.getcloudapp.com/ApuAjd8e
Field Transform
As all the form fields are actually Gutenberg Blocks, I have implemented Blocks Transform API in use here to transform field types to another with a click. So you can transform the checkboxes to the radio, select and retain the options. Similarly, you can transform other field types.
https://share.getcloudapp.com/4gujyE75
Add-ons
I have already released first add-on/integration that os for MailPoet. More to follow along. You can get this add-on from here.
https://wordpress.org/plugins/guten-forms-mailpoet/
Flexibility for Devs & Theme Authors

Although I haven't put in efforts to create hooks and filters in this plugin yet to make it much extendible,, as this is based on Gutenberg Blocks developers can already extend it by modifying blocks the way you can filter any Gutenberg blocks. But I plan to make it more extendible in the near future. Theme authors can already recommend this and include/register their custom styles for the form using the Block Styles API. And thus they may have a branded form for their theme users.

Having said that, as you mentioned, there are still rough edges and a lot more to be added. I am requesting feedback from the readers of WP Tavern. Kindly try this out and provide your feedback to improve this plugin. 🙏

Regards,
Munir