> Are there real uses for this kind of thing, on modern architectures?

For me, I came up with an algorithm for doing error correction coding, however, good performance can only be achieved by JIT'ing code. Trying to implement the algorithm without JIT results in many if/switch statements and memory lookups, which makes it much slower. Unfortunately, the JIT'd code can only be used once because a new function needs to be written every time the routine is called, which leads to a scenario like that in the article.

Otherwise, I do think this is somewhat niche, but there may be some interesting applications if the security of write+execute memory is not a concern.