At the last apartment I lived in, I thought the people in the unit below me were constantly running an unbalanced washing machine, as I would frequently hear this loud, rhythmic THUNKA THUNKA THUNKA THUNKA coming from underneath my floor, usually for hours at a time. At least, I assumed it was a washing machine, since nobody has that much stamina for it to have been anything else, I thought.
After a few weeks, I put in a noise complaint because it was starting to get irritating. When the management followed up a few days later, they told me that the tenant below me just had their ceiling fan at full speed and two of the bolts unthreaded themselves, causing it to knock around wildly. And the tenant was deaf, so she had no clue her ceiling fan was only a few days from loosening itself completely and falling apart.
It's honestly a little insane that after over a hundred years, we haven't come up with a better way to move air around a room without dangling 50 pounds of spinning death above your head.
There are other ways to move air effectively, but it takes a lot more complexity. Those Dyson fans are an example, they move a lot of air with a much smaller fan.
You just need a cheap ceiling fan balancing kit to fix that. Pretty much every fan comes with one, but almost everyone skips that step in the instructions during installation.
There was a fan in my last fire departments bay (where the trucks are kept) named (for real) "Big Ass Fan". It was literally 20 feet across with metal blades and the adjustment was a percentage from 1 to 100%. 100% was a whirling death wind of speed and sound. If a blade where to ever fly off it would put a hole through a wall or slice a man in two.
Properly built, properly installed ceiling fans don't vibrate. My $70 dollar ceiling fan from a big-box hardware store has no vibration whatsoever, even at maximum speed.
That's because it's new. The wobbling ones are not the cheap ones, they're just old. People buy a house and it has a fan and they never think about it just like you never think about a light fitting.
The one in my grandmother's house is probably around 50 years old, no one thought about it until it basically disintegrated one day and then we realized that no one has any idea when she bought it. Found a manufacturing date on a label.