I used Pagebuilder on a project but eventually got rid of it. It was confusing for the end user to edit content because they couldn’t see it within the blocks. The blocks introduced unnecessary elements to the page, like forced <h2> titles for example. I had to enter edit mode on each block to see what was in there.
Great idea, necessary in some cases, but not refined yet.
Plus if you have 2 or more pages that need a similar layout, you’d have to build it all over again for every page. Unless they have generic layouts that can be applied and you just fill in the content?
So useful, yet such a pain!