Yes, maybe even before it got acquired by Google?

This library seems far better optimized for vector rendering, it's capable to only render updated tiles by itself. Skia requires application developers to do that; a significant API/architecture change would be needed to have it built-in.

I could see someone using both: draw vectors using this library, composite layers using Skia.

Yes, Skia uses the traditional method of tessellating path geometry on the CPU and then having the GPU handle transforming and shading it as if it were 3D geometry. Compare that with what we see here, which using compute shaders for the whole process.