Stealing Yoroi's technique and building around it ties into this on multiple levels. On the first, Hisana once again found an underused jutsu and explored it ruthlessly, stealing it from her opponents. On a deeper level, working in the direction of chakra drain lets her literally use her opponents strengths against them.
Because of the way that external chakra manipulation techniques naturally scale to the level of ones opposition, they're a natural fit for Hisana's role in the story and her desire to be able to alter canon - letting her affect relevant change on very high level combat while not needing to reach that level as desperately herself. Thus, in addition to being thematic, it's also a practical consideration for the circumstances she's in.
It will of course take a lot of effort before she can even do something as relatively simple as work on Yoroi's jutsu until she can channel it through a sword instead of requiring palm contact, but it's a path for her development that I'm very much sold on. And in the long run...? Chakra dispersing "Anti-Magic Fields" area seals fall into her "chakra manipulation" fuinjutsu theme, as would more directly applied chakra draining or inhibiting seals.
Imagine just cutting off the connection Nagato has to his Paths, or that Kabuto had to the Edo Tensai. Or encountering a hostile Sage Mode user (we aren't the only transmigrant, and it's one of the classic "paths to power" in Naruto) and being able to disable their balance of physical, mental, and natural energy with an applied seal. Insta-statue.
My only real complaint is that she doesn't have the Magpie summons yet, but since they're Corvids, even that is on theme.
