If you have a decent vacuum cleaner that has efficient suction, and if you vacuum regularly and don't just leave it for weeks, there is no reason why that vacuum should not reach into anything that is in there.
Then once or twice a year, a deep cleaning with the right equipment you can rent for a day or get a company to do it.
Don't be so sure sure there isn't all kinds of dust, human skin, pet fur and dander and even creepy crawlies in your HARWOOD flooring too.
I've had dust bunnies and pet hair tangle up in my vacuum from vacuuming HARD floors just as much as carpet. I've seen hardwood floors and tiled floors AWASH with giant dustbunnies of pet hair floating all around.
And critters can be between the cracks and joins of hardwood flooring.
True story:
Many years ago my then-husband and myself were apartment hunting. We found this place with a phone number in the window, called, and the owner said we could look around by ourselves, the door is not locked, go on in and take a look.
They wouldn't come to show us around.
So we went inside this little place. It had all-hardwood floors. At that time I had not yet formed an opinion either way, so that was fine by me.
We walked around. We liked the place. My husband sat down on the hardwood floor and said what do you thinkg, can you see yourself here? etc.
I sat down on the floor too and we chatted about it and the rent that was being asked, and if we could afford it.
SUDDENLY ........we were being bitten. We looked down at our skin in our summer clothes, and we had FLEAS all over us!!
We saw them coming out from the floorboards.
Seriously, they had been in the joins between the hardwood flooring. We saw them emerging.
We had to run home and jump into the shower to get them off us. The place had been infested with fleas.
Don't ask me how they were still alive without any hosts living there. But we saw them actually come out from the fine lines between the hardwood floor boards.
So when you worry about dust, other detritius etc being able to fall deep into a carpet and stay there, just remember, stuff falls between hardwood floor sections also, and stays there.