Ok, so I don’t think lando is broken, at least right now. I define broken as essentially running the Mets and bending the entire game around something, like taking out a certain threat akin to the Aegislash and Naganadel metas. Lando, on the other hand, despite what usage may imply, does not do this. If anything, the reason it is so consistently used and so good is that it just has enough solid sets at its disposal to deal with whatever meta trends may come its way.
For example, lando was running a lot of z- move variants just a few months ago, to break some of its checks at the time. Then it’s checks and counters were able to adjust accordingly and play around it. That one role became less viable as a result, and so it goes ahead and fills another role, that may be more effective or necessary in the current meta. It’s “best set” is constantly fluxuating because it needs to adapt to the meta beating out certain sets, not the other way around.
Even now, scarf was nigh unviable pre-USM, but now it’s one of lando’s best sets because that was what it had to change to stay viable. It is not the one big controller of meta trends because it’s sets and their separate viability are all affected by these meta trends, unlike the two previous examples, who simply warped the meta around themselves and barely, if ever, needed to adjust.
Those are just my thoughts though, feel free to point out where I’m wrong, I’m very new here.