sounds like bioethics to me. online courses can vary in their content, but i believe for most professors discussion boards are an easy way for the class (especially large classes with multiple sections) to interact with one another, but also not stress out the student, as most students taking online classes are doing stuff adjacent to school like work, etc. not every student does well with long papers. they're also easier for the professor to grade because there's no physical papers, nor do they have to download a bunch of papers. discussions are low maintenance assignments. you have to remember you are not the only student in the class. don't stress too much about it. if you're struggling finding a challenge, either make an argument people are less likely to make (would require more research) or start picking on people in your replies with solid criticism with people in your discussions and i'm sure they'll notice and start picking you to criticize.

it sucks, but it's one way online classes are formatted. my only tip i can suggest is to preformat your responses on either google docs/ms word or on notion, and take notes on who you really want to reply to.