Burst mode is the equivalent of a Bloom form for Ixbal, given that she is an Android and she possesses an Adamic crystal the shape she takes is a bit different from a usual Bloom form like the ones we can see from anyone in the party.
This form intentionally turns her more into a machine, symbolizing her status as a Tool rather than an individual or a human, which is the way Sophia/syzygy saw her when she was created.
Ixbal might feel at times that her only purpose is to be useful to Asher and company, so she might think the only way of achieving that is to renounce everything that makes her human in search of more power. A dangerous line of thought that conflicts with her desire for freedom and search for her identity.
A situation showing these themes might take place during the main story, maybe ixbal while using her Burst mode, she is unable to get out of it almost like she has entered a trance where her reasoning is not working properly since she has become what everything wanted, a Weapon with no voice. This might remind us how powerful and dangerous Ixbal is and also a cautionary reminder for Asher to not push people too hard in search of strength.
(I'm thinking of a similar scenario/vibe to the Skullgraymon episode with Tai forcing Agumon to evolve in search of power in Digimon)