To give Chuk some credit for once, people tend to conflate the max wind speed of hurricanes with the max wind speed of tornadoes, large tornadoes achieve much higher wind speeds but they last a far shorter time and are much less stable than a tropical cyclone.
The reason we stop at Category 5 is because the categories are more about the destruction caused, with sustained 157+ mph winds resulting in pretty much total destruction. There is talk about creating a Category 6 every time we get another Irma or Dorian, but what is the point exactly? Dorian utterly obliterated the Abacos and Grand Bahama, but it would have done the same damage if it's sustained winds were 20 mph lower. There's zero point in creating a Category 6, let alone 7 or 8. It's the same trash tier writing as giving US Agent 3 Medals of Honor, because the writers have no fucking clue what they're writing about and wanted a big number. Category 6 doesn't sound dramatic enough, let's make it Category 8! Except Earth's climate is barely capable of producing hurricanes that could be called Category 6, so the idea of a Category 6 is completely ridiculous.
And that's what I was complaining about, not the made up hurricane category specifically (although that is dumb) but their ideological need to cram climate change bullshit into the show. Why haven't Shuri and Riri solved climate change by 2050 considering Shuri's vast intellect utterly dwarfs that of Bruce Banner and Tony Stark working together, and Riri Williams will probably be the same?