Love the article, just one note: I think #1 is not necessarily constrained as it may sound. Especially with Heroku, I think it is very easy to upgrade later on

Love the article, just one note: I think #1 is not necessarily constrained as it may sound. Especially with Heroku, I think it is very easy to upgrade later on for most set ups, not too much special code or conventions. The major one would be probably the read only file system, but I'm sure using Amazon S3 is not that bad