Even if fireworks were banned, it's the easiest thing in the world to get agricultural rookscarers, which are cheap as chips and very loud. It's also surprisingly easy to make your own fireworks.
I'm afraid that if fireworks were banned, people who are really keen on them, or intent on causing disruption for shitz and giggles, would make their own, which would be far less safe.
Fireworks are rated and only the lowest categories can be sold to the public. The most powerful of these, category 3, should only be capable of travelling 25 metres. They have to be supplied ready-fused.
Category 4 fireworks can only be purchased by people who hold the appropriate pyrotechnician licence and are unfused.
I think one of the reasons fireworks seem louder is because it's now possible to buy lots of Cat 3 fireworks all fused together in a sort of ready-made display (or "cake", as the local firework people call them). You light a single fuse, and off they go.
For around £100, you can buy a 10 minute burst of fireworks all in one box, all fused up and ready to go, from a garden centre or wherever, and they will sound loud, because they all go off in quick succession. If someone with money to burn buys several big "cakes" and sets them off all at once, it will sound really loud.
I'd like to see the sale of "cakes" prohibited, and go back to selling individual fireworks, either as an assortment or singly.