- moon dust has very fine particles. It is very irritating for skin, and there was a very good chance it could damage lungs like azbestos.
- Electronics and dust do not mix well
- electrostatic properties were not known, it could stick to every surface and coat it, perhaps prevent vacuum seals etc... Look at images from inside capsule, before and after landing! And that was just dust, brought on suits, not full samples!
- it had horrible smell
What’s more: “Unlike dust particles on Earth, dust on the Moon’s surface is sharp and abrasive – like tiny shards of glass – because it hasn’t been exposed to weathering and elements like water and oxygen.”
https://www.nasa.gov/centers-and-facilities/kennedy/nasa-tec...
and
> it had horrible smell
We shouldn't know what it smells like. That's forbidden knowledge, just like the taste of uranium.
Does it smell strong because of it's composition or because the vacuum of space has a strange effect on it? Like the particulates not dispersing enough?