Earlier quoted context omitted.
Heroku not being AWS might be a feature. I'm not sure if AWS wouldn't try and integrate them and "break" something in the process. Whereas now, they still get money from it (Heroku runs on AWS) and can offer their own "alternatives" as part of the larger AWS offering.
Heroku not being AWS might be a feature, but Heroku being Salesforce is straight-up terrifying. I'm probably not moving my apps off Heroku anytime soon simply because they're running just fine maintenance free, but I'm not going to risk running any future apps on a Salesforce platform.
If anything, Salesforce has been moving more of its core developer experiences over to the Heroku model rather than trying to make Heroku more Salesforce-y.