I've seen millions of dollars spent on infrastructure to support what Heroku could do for a few thousand a month. Not to mention the egregious dev heartache caused by having to work against it. Anyone who argued it was a waste of time and money just "didn't get it" apparently.

I'm a huge fan of all the cool container stuff, queues, stream processing, all the weird topologies for apps built with node, Golang. I'm with it, kids. But for an MVP, just use Heroku, GAE, a Droplet with SCP for god sakes.

If you need to do something more complicated, growth will tell you.