In reply to Mike.

Good summary. These page builders do provide me, as a developer, good work. Here's an example. We've an offshore client where we maintain their complex ecommerce areas on 3 sites. But they recently hired a local 'web designer' friend to redo their home page only. This kid, with no real wordpress or coding background, just loaded in elementor pro to do it. They loved the design. Sadly, the site speed collapsed with full load time going from an already poor 7 seconds to 24 seconds. Adding in 12MB of imagery, videos and sliders didn't help, but there was also an explosion of css and js files from elementor and the extra plugins he added. Some host tweaks, CDN, caching and image optimisation I got it down to 12 seconds.
A discussion with my client resulted in me trashing elementor, loading a cleaner theme and we now have a 2-3 second page load time, on a similar look, by just using some css and simple gutenberg tools for the layout. And all done and fixed in a couple days.

I shouldn't complain here as this is how we get a lot of my work, fixing such nightmares - Amateurs building sites using these GUI tools with no concept of how websites actually work or the importance security, speed and google ranking. I will add that some of those third party gutenberg addon blocks I tested had similar issues, exploding site size and overhead. It's not what they do, but how they are used by the untrained, that also makes a difference.