Have you ever actually dealt with Drupal and it's modules? The process to install and upgrade them is extremely poor. WordPress is much more technology advanced in that area. The only way to sanely deal with modules in Drupal right now is by using Drush. While using Drush is great and CLI tools will always be needed, other options have an opportunity here.
Composer doesn't provide the same user experience that some people expect coming from the mobile world, which is the intention here. As for as the background updates Drupal Issue opened, that's absolutely great and I think sorely needed. I hope it gets pushed through. That doesn't solve the issue of installing or removing, or handling billing, across multiple sites. Pantheon has some really good tools built-in but outside of that, there's not much available at the moment.