I'm having trouble finding a good phrasing to describe a component of a system that is too important -- in a sense that it distracts a person from all the other components, that should have been, or were formerly, important aspects of the experience. The case where I'm trying use it is something like this:
We tried adding a new super-queen to our variant chess game that could move anywhere -- but we found that it was ______, and that none of the other pieces were important to the gameplay as a result.
Another example, possibly from academia:
We recommend that teachers not offer students extra-credit work during a semester. We have found this to be _____, in that the option routinely distracts students from the main body of work and preparation for exams.
The key thing I'm trying to highlight is that participants in the system become hyper-focused in their attention on this one component, to the detriment of the other parts. (E.g., while the chess example indicates an overpowered piece, that's not what I want to emphasize here; it could also be the result of a super-weakness that becomes the only thing you'd want to attack, say.)
I could also imagine this being used in a work of art: Say, an element of a painting that is too bright or oddly placed. Or a breakout character in a TV show who takes over what was meant to be an ensemble story (i.e., they "may... overtake the other characters in popularity, including the protagonist").
Is there a good word or phrase to indicate this state of being too important, and attracting too much attention?