Haha, my take is this: everything we do here is for fun. Most of the things we do do not make any sense if you think about them, but we still find them fun, so they are worth it haha. For example, I spend months optimizing my games to make them fit within the artificial boundaries I impose myself (32KB or 48KB cartridges). What is the point? I could just use a megaROM and move on with my life, or even make a better, larger game. But that is no fun, and I would not do it. So, it's all for fun. Same with an accelerator card: does it make sense? not at all! haha (if you want more power, just use your modern computer!) But would it be fun and bring joy to whoever designs it and the 4 people that will ever use it? probably YES! So, it's worth it 
my point is more general here, there is no need to use an chip with capabilities of sony ps1 chipset for retro hardware, this is insane in very nature, kinda using electric motor with battery for stirling engine demo model
Tell that to the Amiga community with their Vampire accelerator cards
