I don't see what's wrong with pointing out deficiencies in the free tier. It's not as if Heroku is giving devs something out of the goodness of their hearts. It's part of their business model. He's just telling us that he doesn't use Heroku for his projects anymore because their dyno's take so long to warm up. I don't work at Heroku but I think their strategy is to make it a great / cheap platform to start an app on so that you pay them when your app gets traffic and needs to scale. If the free offering isn't compelling then the freemium business model doesn't work.