I think more specific context on "SQL databases don't scale" might be appropriate here, especially for the noob hackers that are figuring out just which technol

I think more specific context on "SQL databases don't scale" might be appropriate here, especially for the noob hackers that are figuring out just which technology to use in building their first or second apps. Is it worth ignoring defaults and conventions on a simple Rails app and not use an SQL based db? Probably not? And I reckon that Heroku itself hosts a good deal of apps where "will this db scale?" isn't really relevant. I could be wrong. Another question worth knowing the answer to is how much of hassle it is to switch horses midstream (from a well normalized SQL db to something else), after there are some data in the tanks. Maybe this is Adam's recommendation specifically to the dreaming-big community, which I can certainly appreciate. And maybe everyone should be dreaming big.