Well, epsxe doesn't update frequently anymore due mainly to two things: its coders have busy lifes, that doesn't let them keep up with it as before, and epsxe has reached a stage in development where is quite hard to improve anything. ePSXe is almost feature complete, so what's left is mainly bug hunting, and the ones that are still there are quite hard to isolate, and even harder to fix without braking other things (like what happened with release 1.6.0, wich fixed some games, but broke others that were compatible before, like FF games). The same is bound to happen to almost any emulator. Of course, it might be surpassed some day, PSXeven is already there, but it's not as easy as you say. We'll see if/when Ssspsx reaches that stage.