After having updated to Wordpress 5.0.1 the block editor was very slow. I ended up making a clean install of Wordpress and am currently using version 5.0.2. I don’t like the block editor and find TinyMCE much more user friendly.
I’ve started thinking of migrating over to ClassicPress, but my concern is if plugins will continue to be supported for ClassicPress.
For me Wordfence and Yoast SEO are the most important. I don’t think Jetpack will be supported in the long run, so I’d probably need to find other alternatives for things like mailinglist and stats.
I know Wordpress won’t be having the Classic Editor around forever.