While the 168mb is ridiculous, I'm more facinated by the choice to depend on an unimplemented feature from a group/company they had no control over or contracts

While the 168mb is ridiculous, I'm more facinated by the choice to depend on an unimplemented feature from a group/company they had no control over or contracts with. I would hesitate to depend on things which haven't been released for a few months/years. I realize the web moves fast and some might prefer working with new technology, but this sounds so weird to me.