[gabizou]

The applications for Mixin wasn't to mock a method or two, it's to enable full-scale modification of an existing Java application at runtime without recompiling/redistributing the original application. In the case of its origins, modifying Minecraft server to add a non-obfuscated API and implement said API on top of it through Mixins. The way this is achieved is practically at the class load point in time so the runtime costs are reduced to maybe a couple of seconds (as of current writing, Sponge has somewhere around 1.2k mixins overall). Could there be a better native API? I'm hoping so, Java's Class File API (JEP-484) is a pretty good start, but I don't think it's quite enough yet to enable the full functionality of what Mixin does.

[1]:https://openjdk.org/jeps/484