I mean, statistically a certain amount of people will always dislike a champion no matter what, so you finding Varus unhealthy is valid, but then so are the opinions of others on the Boards. Because League is a game with many players beyond just the Diamond+ level (in fact, most players are under Diamond), it's generally better to go with general consensus, rather than one group over another. There is a case for how champions can be healthy in some divisions and unhealthy in others, and could therefore require targeted adjustments there, but overall the general consensus, and not just on the Boards, seems to be that Varus and Sion are healthy overall, even if they're significantly overpowered.
People like to complain about the Boards as if it were exclusively populated by low-elo players circlejerking around X champion, but the fact of the matter is that there are players from all divisions here, and repeated complaints for literally every class of champions. This space perhaps isn't the totality of the League community, but it's nonetheless a diverse enough sample of players, and so imo a good place to gauge general trends for hot-button problems in League. As such, elitism towards players below some arbitrary cutoff point doesn't really contribute to discussion, and merely draws line in the sand by dismissing valid player opinions. In this respect, while I don't think your opinions on Sion or Varus are invalid, that does not contradict the fact that there seems to be a general consensus overall that these champions are healthy, or at least healthier than the average champion.