Drupal 8 architecture decisions. Standing on the shoulders of giants.
Until recently I've been less than enthusiastic about Drupal 8, but I've changed my tune (and of course nothing is perfect; I am still a bit concerned/sad that Drupal 8 could possibly be leaving some smaller sites behind, but this is a ship that has likely sailed, so c'est la vie).
What led to this change of heart? Simply, my understanding of just how much, and in what ways, Drupal 7 and previous versions of Drupal differ from widely established/modern techniques and/or best practices of higher level computer science/programming. Arguing whether this is true is comparable to arguing whether square wheels work better than round ones. All of the best programmers, across many different languages, and frameworks don't end up at the same basic conclusions for no reason. This is empirically evident for anyone who has looked around, studied, and experimented with solving problems that, as it turns out, have already been solved before. Drupal 8 will stand on the shoulders of these giants of programming.
To wit, a Drupal 8 programmer will not need to feel behind the times to anyone developing in Java, Rails, Django, or you name it. In fact, a Drupal 8 programmer that embraces the changes and learns the fundamentals underneath the implementations will have a much easier time being able to grasp those other languages/frameworks because Drupal will share more fundamental paradigms with them than it differs by. The reverse is true as well, of course (e.g., programmers from other languages will have an easier time coming to Drupal).
So, to keep this short I'll just close with this - embrace Drupal 8 and the future by starting to learn all the design patterns and OOP fundamentals you can (I recommend not just reading, but making something medium to large sized from scratch). The truth is this; if you think it's time to ditch Drupal and reach for anything other than WordPress -- objects, interfaces, design patterns, dependency injection, event models, etc will more than likely still be waiting for you there (and if it isn't I'd recommend passing, anyway). Drupal's architecture is just catching up with the rest of the more advanced computing world. Hop on board.
P.S., the scale of refactoring that Drupal 8 is undergoing to shed it's imperative/procedural/tightly-coupled skin is truly a monumental task. Allocate your criticism and judgement appropriately, and give things some time to expand and evolve.