Silence is golden

In the past, road sweepers used to use a rather efficient device called a brush, or a broom, something that had a rather nice rhythm to it, wiish wisshhh  tock tock. It didn't make much noise. Oh but these days, when the price of petrol is high, the need for machines, the need for noise to make it appear that you are doing something. Like teenagers with motorbikes, taking the silencer out of the exhaust just so you can hear them coming 20 miles off Yep, I'm on a big bike, lots a noise! It's crap as we know, the engine is just a small wee 50cc engine that is just a noise maker.
You'll be wondering what the hell is this writer on about? Yep, there is some logic to the madness that lies beneath this crazed mind.
It's a nice sunny morning, it's neither too cold, nor too hot, just right, you hear the birds in the trees (ok the bleeding pigeons cooing away) then along comes some motorised sound! It's the new engine powered leaf cleaner, Wrrrrrrrrrrrr wrrrrrrrrr wrrrrrrrrr You know the ones.

Yep, those things, those machines that kill silence, of a nice morning. Why are they needed? They are noisy, generate pollution, and I can't say they offer any benefits to the user except broken ears and an extra long arm?
What's wrong with the good 'ol brush? you remember, the Broom and brush that would do the job effectively and not wake up the whole neighbourhood!
I would like the guy who uses this machine at 8am in the morning to be woken up at 1am with one of those machines. It felt like 1am to be till I looked at my clock...
What's wrong with this?

well tell me ?