Originally Posted by
Kuroimaken
Frozen, Frozen, Frozen... CLEARLY you aren't being devious enough.
For one thing, Tamaki's power would be extremely invaluable to anyone who got his hands on it. Forget revolutionizing the weapons industry. Consider how many different materials and processes he could come up with. With a simple baseline of study, Tamaki could conceivably resolve any and all engineering problems inherent to high-energy, high-yield power sources, just to start.
It is true that technology level-wise, Soul Society and the like are more advanced on a number of levels. However, their ready access to purely spiritual resources (AKA Magic) has stunted their growth otherwise. If you had the ability to create fire at will, why would you need a lighter? And even so, their research speed isn't greater than it's supposed to be.
Mortal society, on the other hand, has depended on its ingeniousness to survive, and that cost them time and resources - including the time to dissuade those using older tech from stunting the growth of better technology. Our dependency on oil comes to mind.
You missed my point with the bread-maker. For one thing, Tamaki could, given enough time, improve his own "storage" capacity, but that's hardly even the point here. He could, essentially, circunvent the "one of a kind" problem by stepping up the responsibility to one of his own creations. He could make a bread maker factory, or a bread maker factory construction facility. He could conceivably "dumb things down" and come up with just the blueprints to his inventions at a level regular humans could construct. He could come up with processes that turn regular materials into the materials required for his inventions. Creating the tools to make his creations available to the general public - and more importantly, creating the means to create those tools - and teaching regular humans how to use them could basically set Tamaki for LIFE.
And anyone who discovers his secret could try to kidnap him and make that secret work for THEM.
TL;DR: I'm trying to set up nefarious plot here.