I don’t have a Dyson, but my vacuum also struggles with items so big they don’t fit under the roller. I don’t generally find it to be a problem because at that size they’re easy to pick up.

Not defending Dyson, there’s a lot of valid criticism here, but at some size pieces are too big to vacuum, and if that size is Cheerios, maybe that’s not much of a problem?

I’d rather have a vacuum that does well at the small stuff I can’t reasonably pick up.

Buy a dog. The dog picks up the cheerios and the $700 Dyson picks up the dog hair.