In reply to David Decker.

What caught my eye was your sizing info:

WP 4.9.8:
zipped: 9.5 MB
unzipped: 30.8 MB

WP 5.0 Beta 1
zipped: 14.5 MB
unzipped: 49.4 MB

I decided to take a look at something because seeing those numbers made me remember something I discovered about the difference between WP and Joomla (Joomla which offers a ton more features). So I installed a fresh Joomla on my local:

Joomla 3.8.13
zipped: 12.8 MB
Unzipped: 30.2 MB (after install)