Hi there,
Do I have to design all the pages from scratch, as maybe it was suggested here in the forum form a previous topic I found out?
Unfortunately yes. You cannot convert Elementors code to the code required by the Block Editor. So if you disable Elementor you will be left with just the unstyled content in the WordPress editor.
Which are the benefits of using GenerateBlock, maybe the free version, instead of using simply the native WordPress editor , that is Gutenberg?
GenerateBlocks simply adds 4 ( soon to be 6 ) blocks to the editor.
Container
Grid
Headline ( advanced text block )
Buttons
Coming soon:
Query Loop
Image
And what they offer is deep styling controls from spacing to typography to colors to backgrounds. So if you want page builder style editing controls in the Block Editor then GB is something you may want to consider.