Looks promising to me, how ever being non coder looks difficult to understand it while creating custom blocks. it will take almost year to get in routine and custom development.
I let my customers handle their websites, so this looks good move to me.
writing shortcodes for each and everything is panic but if after writing some blocks it may help, if it allows custom fields, forms and supports custom post type in future then it will be awesome feature.

I like UI, its neat while using fullscreen, modern and I am sure it will evolve much better in future !