It's not as much about experience as it is about trade-offs. I've worked a lot with Vulkan and it's an incredible API, but when you're working alone and you don't have the goal of squeezing 250% performance out of your GPU on dozens of different GPU architectures, your performance becomes pretty much independent of a specific graphics API (unless your API doesn't support some stuff like multi-draw-indirect, etc).

The answer is middleware engine, all of them with much nicer tooling available, without the constraints of a browser sandboxing design, for 2017 graphics APIs minimum common denominator.