Depends on the class, but some people are really insistant that you say "I firmly believe" or "I feel" because everyone has different points of view, and even though it's obvious it's your opinion/feeling/belief because you are the one saying it, prefacing it with something like "IMO" is a way to make people less butthurt because you are stating that it's just your opinion so other people can have their opinion too.  Source: Shit I learned in Non Profit workplace settings. I assume with the SJW invasion, this mindset has become a thing in the University setting as well.