The big problem with 5.0 is that it's not actually ready and they are shipping because of Wordcamp.

There are 152 open issues that they conveniently allocated 1 to 5.0, 28 to 5.0.1 and the rest to future point releases. https://make.wordpress.org/core/2018/12/06/5-0-gutenberg-sta...

The introduction of Gutenberg is a huge change and yes if you've been following the development, you're probably ready for the major changes but if you weren't following along you're in for a nasty, buggy, surprise.