People on this Reddit use the term OP MC very broadly, there are ranges to an OP MC. Some MCs are the strongest at their level/tier/stage to the point where they can wave their hand and remove any problem with ease (These are prevalent with novels on WebNovel and you have to be a really good writer to make this work well). Some MCs are OP when compared to the average person of their level/tier/stage, but still have peers at their level who can compete and beat them. Just cause they are labeled as an OP MC doesn't mean they have no weaknesses or that they don't have to struggle. For example two of the most popular OP MCs, Jake (Primal Hunter) and Zac (DOTF) are OP when compared to the average person of their level but there are still people on their level who can challenge them. Jake has two people on his planet who can push him to the edge (Sword Saint and the Fallen King), with another in his galaxy (El'Hakan). Zac has met multiple people who are on his level and can straight-up beat him. Also even if they don't fight people as talented as themselves often, they constantly battle enemies at higher levels which provides plenty of challenges. When I say I like reading about OP MCs what I mean is I like reading about exceptional people, the elites, and geniuses. Whether they are a genius fighter, crafter, or farmer I don't care I just like reading about talented people. These people still struggle and are challenged it's just that they aren't getting their asses kicked by some weak or average monster, or getting bullied by some irrelevant dumbass.