The 5 Strong Arm slots are on purpose, via the creator. What is a mistake is the 5 Improviser slots instead, which personally I don’t really have a problem with

Honestly, I kinda hope they keep it that way. Either that, or just make the first slot Strong Arm, and leave the rest as Improviser. That'd actually make it better, as you could get 4AP Gunslinger on an other pure Improviser.