You have to be realistic when trying to apply these definitions to Monotype. While having no switchins to something is undoubtedly a good argument in OU where within reason you have almost every option available to you outside of a select ~50 pokemon, you have to consider that bound by the limitations on which we can pick our teams from, in practice we're never going to have switchins to stuff like Keldeo on Steel or Diancie on Fire. That doesn't make something necessarily broken, as the more important thing is do they blow through multiple Monotype teams such that their very presence is centralizing the metagame in such a way that carrying this pokemon gives you an assured win or as good as.
The arguing about OU bans in the first place is unnecessary, even more so generalising and calling everyone who voted ban on lando "stupid". I was one of those apparently "stupid" people and I don't regret my vote one bit, but I've never thought Lando-i is broken here, and that's my honest opinion. I believe on Ground it plays a necessary but healthy role, and on Flying while it's undoubtedly a fantastic mon, it's kinda forced to run SR sets or your team will become kinda redundant with Skarm forced to run it when you'd rather Defog, or you having to run Gliscor and Lando on the same team. Top threat no doubt, but not a broken one.
The arguing about OU bans in the first place is unnecessary, even more so generalising and calling everyone who voted ban on lando "stupid". I was one of those apparently "stupid" people and I don't regret my vote one bit, but I've never thought Lando-i is broken here, and that's my honest opinion. I believe on Ground it plays a necessary but healthy role, and on Flying while it's undoubtedly a fantastic mon, it's kinda forced to run SR sets or your team will become kinda redundant with Skarm forced to run it when you'd rather Defog, or you having to run Gliscor and Lando on the same team. Top threat no doubt, but not a broken one.