Because they can't customize STEEM to their business logic. There are two arguments: 1. It's a bad idea, 2. No one else is doing it. 1. Most Steemians agree that it's a good idea, if you don't agree with them, that's cool, it's your opinion. 2. No one has presented any proof anyone else is doing it.
RE: Don't Wait for SMTs to Start Building Your Steem App