I have been riding for...blimey 45 years..I'm sure others here have ridden for far longer....and there has been a catalog of times when an accident has been avoided simply because the sound of the bike was the saving indicator to another road user.
What we are talking about is a sensible compromise between excessive annoying sound pollution by the thoughtless and a decent audible footprint that there is a vehicle present. I don't think the culture of continually ramming the horn button every few seconds - as used in many developing countries - will ever catch on here, though technically the horn is fitted to let other road users know you are there. Constant horn pressing would be even more annoying to everyone around as you filtered through traffic or passing through the suburbs when people want to sleep. Ride around India for a few weeks and you wouldn't want that bedlam here.
As I mentioned, traffic noise is destined to decline rapidly anyway thanks to the killing off of the combustion engine in the next decade, so I see no reason for any government to waste their energy and resources with silly nanny state cameras and db meters, when that energy should be focussed of far more important issues we are facing today in a global pandemic and widespread unemployment looming. Amen.