The lack of a 75 token Offensive Simple Infusion seems like a simple oversight that can be easily corrected either by adding an Simple Offensive infusion, or changing Versatile into Offensive.
The whole current implementation of “Versatile Infusion” makes no sense anyway; when something costs hundreds of tokens or hundreds of T6 mats, you’re going to craft precisely the stats you want.
Now if Infusions could be switched in and out of items, or if they provided a small amount of two stats (one damage-oriented, one defense-oriented) maybe then it would make sense, but that’s not how they are right now and even if they were, 225 tokens vs 75 tokens is an absurd disparity in price.