This generally applies just as much when one has mediocre photographic equipment.
It doesn't, because mediocre equipment is more prone to failure - it's less reliable - and it tends not to do what it purports to do very well. That's true of all mediocre equipment, not just cameras.
A dollar store hammer will drive a nail. Use it to drive 1000 nails and your arm will fall off.
I hate grain and the fuzziness.
I don't think grain is interesting
You miss the point. It's not about what you or I like, when you talk about how some people use cheap cameras, purposely overexpose and overdevelop, or whatever they do. It's all only about what they like.
They tend to think the equipment or process adds something to the image.
They tend to think grain adds character or mood to an image.
They would find tack-sharp and grain-free images mundane and boring - or, at the very least, it's just not what they're doing so don't have much to say about it.
Also, well over 99.99% of the photos taken by anyone, any time, anywhere don't matter in the slightest. It's pretty petty to dismiss them as being grainy or fuzzy when even the sharp ones end up burnt in a dump.