The thing with tenten is, she is a potential walking deus ex machina in that as someone who uses sealing as a fundamental part of her arsenal, she can have a scroll with anything you can think of sealed inside it. I bet she could furnish a house (which she also had sealed) just by unleashing a second scroll. And when you think about it logically, why WOULDNT you have pretty much everything on earth you can get your hands on sealed into scrolls if you could do it? You would never be unprepared for an emergency. Illidan himself would be like, "Yup, dudes prepared" And imagine the savings on storage rooms and such when you can just go "Oh im losing the house? /poof sealed my bedroom set, lets go to the next room" Fuinjutsu is just so fracking awesome in its potential.