Why I've Not bothered With Drupal 8
I'll write some notes up at some point, but this is a link to the slides.
"I thought this was quite a dry subject title, but it was actually a really interesting presentation." (Attendee at DrupalCamp Scotland 2019)
I did quite a wide trawl for information to reinforce my own thoughts, but you can read much more on webchick.net and jeffgeerling.com