Is onus a positive word?

I'm curious to know if the word "onus" carries a positive connotation. It seems to me that when used in a sentence, it often implies a sense of responsibility or burden. For instance, one might say, "The onus is on the individual to take care of their own finances." In this context, it doesn't seem to evoke a feeling of positivity, but rather a sense of obligation. Am I interpreting the word correctly, or is there a more nuanced meaning to "onus" that I'm missing?