A "dimension" is just something that can be measured. Imagine you have a square of paper and it has 5 coins on it. It has a width, a height, a thickness, a coin count. That's 4 dimensions already. It also has zero elephants on it, now we have 5 dimensions!
The trick is to only consider the "dimensions" you're actually interested in.
It's ok to grind "good" beans in a shitty grinder, it'll still taste a little better than cheap nasty supermarket beans. Just don't waste the really great stuff, it'll still taste only slightly better that the cheap stuff.