My company hosts a whole bunch of critical software on Heroku. It generally works fantastic. We do use relatively less "batteries infra for some of our services

My company hosts a whole bunch of critical software on Heroku. It generally works fantastic. We do use relatively less "batteries infra for some of our services, and we'll probably shift further in that direction, but I think you're underselling just how effective Heroku is. It goes a long way towards letting your team worry more about the business domain and less about the infrastructure concerns that aren't at all unique.