> I am a developer, Do I need this API?
No, if you can build your own rendering system with all these features and able to make it run this fast. You don't need this API.
Building it is one thing. It's not even uncommon for people to be right about that part.
It's the maintenance, support, training, operations, and documentation that will kill you, if you think you can "just" write some service and then move on to other tasks.
I like how you addressed this in the FAQ, because this is such a classic take by some users of HN. It's fine if you don't want to use it, but a lot of people would love to. Nice product by the way.
Your FAQ is great hahaha!