I wrote this for a number of reasons but oddly enough Java probably has the most options as far as runtimes go but the support is pretty fractured. The underlying runtime adapters add support for wasmtime and wamr as well. There are two JNI implementations for wasmtime but they are badly out of date and haven't been updated in years. There are a number of reasons you might want to use one runtime over another and this was supposed to unify them under a single interface and make swapping them out easy. It also allows you to easily compare the tradeoffs of various engines.