I have found the WordPress block editor to be quite useable. I think it will be good that I have rebuilt the website using the block editor as that will be easier for someone who takes over the maintenance of the website to understand how the pages were built.
I, however, did find certain parts of the new WordPress to be less than easy to understand as I have built several sites with the classic editor. The biggest issue so far was how to build and maintain Menus. I thought the old method was quite easy to understand and use. The new approach is completely different in use.