Could you expand on what new options Teigu open up?
To clarify, I said the power, "Incredibly craftsmanship" opens up new options, not Teigu themselves. There is a difference.
Also note that I am in no way an Akame ga Kill expert. So my assumptions may be hilariously off the mark.
Now, the power, in a nutshell, allows one to take the attributes of a creature and imbue them into basically anything. Since the result depends on the raw materials used, various parts of the source-creature is used for the process.
So if Joe is willing to go through with it, he can make ccreations that are actually made by power-tinkering. This may not be very impressive power-wise but it offers more utility, which is good. Cape powers are extremely varied so how he can go about this is equally varied. For example, figuring out how to utilize Lung's regenerative ability might be useful. It may not be something Joe actually needs but as I said, it's an option.
Also, this power's description says that Joe can make things that are almost as good as Teigu, but there's room for improvement. He's basically been given the pinnacle of understanding in the field as his starting point. OG Teigu has drawbacks and with his support powers, he can potentially make a 'perfect' Teigu.
Making a Teigu or even Shingu require extensive knowledge and skills in many fields. That knowledge and skills can be useful in other projects, and might have synergy with other perks. (Admittedly most of them may be related to wet-tinkering, which he doesn't like...)
Also I think someone mentioned that this perk might help in understanding and resolving the case 53 problem.
Also the perk mention that Joe can now repair 'other incredible items'.
From a certain point of view, Endbringers are 'incredible items'. While this perk might nor be helpful on it's own, perks stack. So in the future it might be helpful in understanding the nature of the Endbringers and finding a new potential way to deal with them. It's a long shot I know, but it's a possibility.
Sooo did I miss anything? Am I wrong about anything? If yes, let me know.