Dokku is better. And neither is what Heroku's bread and butter customer needs.
But alas, my interest in painstaking explaining why self-hosting is fundamentally incompatible with a product who's value prop was "nothing to install" is waning.
Have a good one.
You and I simply have different opinions on what Heroku's value proposition was, because, again, AWS was also right there and also was "nothing to install." Therefore Heroku was used primarily for its dead simple UX, something which is replicated even in a self-hosted environment, because, again, the value prop was never about PaaS or self-hosting, it was always about the user experience.
Have a good weekend.