Its sad that mangakas are forced to create these run of the mill titles just for sales numbers as original works dont seem to sell well there. And so it comes to be, poor written self insert power trips which throw logic out of the window. Which i presume this will be from description as no rational person would just staight up banish him for not knowing how to use something with incredible potential. Especially "Nobles" which should be well versed in schemes and power strugless (as these are high ranking ones, Dukes)
Honestly i dont really mind the self insert power trip ones, but when its written poorly (illogically) just for the sake of it, its a huge turn off. Plus, when even the first chapter ( the one chapter that you use to garner interest in the manga) is in parts, its a double whammy of a turn off.