WordPress Philosophy seems to indicate that all design decisions are ultimately run by the user base to get a "democratic" voting of what changes to implement or reject. However, the reality is far from that. Is WordPress missing a "voting" system?
Including an autoloader within WordPress is not an all-or-nothing endeavour. With a few simple changes, we can have a fully functional autoloader being loaded with WordPress, and we can start refactoring the existing Core code to gradually load more and more classes (and even functions) through the autoloader.