Depends on the topic. From what I can tell, Lemmy skews young and technical and towards certain personalities and interests, so there are going to be topics that go to those strengths, but also topics where the discussions get mired down in either discussing the basics or get stuck in a pretty unsophisticated understanding of the topic.
It’s obvious with the hyper local discussions (where should I eat in this city when I visit), because there just aren’t enough knowledgeable people to form a quorum for quality discussion. But it’s also true in many of the hobby/interest discussions, simply because there aren’t enough people to where good discussion encourages more high quality discussion in a feedback loop.
It’s true of all combat sports, and, to some degree, any other sport in which you go face to face with your opponent.
And although it might be true that at the very very top levels people both learn to be more ambidextrous (so that there’s less of a mismatch between sides whether right or left handed) and are more experienced/skilled at dealing with left handed opponents, the early years of learning the sport will weed out fewer left handed people so that the top levels have more left handed people.