We banned those, we can demand adequate quality control on electric vehicles as well.
It's rather common where I live, not weird at all. Those are only loud when unmodified and every kit comes with a standard gas tank, perhaps banning them altoghether isn't an answer?
This is fully justifiable not on noise alone, which can be mitigated, but the unacceptable level of hazardous particles released by incomplete oil combustion, which cannot be. Better to write them off like leaded gasoline, the tradeoffs aren't worth it.
The electric leaf blowers I’ve seen (I bought 2, returned one, put the second on “sweeping dust and leaves off concrete” duty, and tried two of my fan-of-electric-anything friend’s battery blowers) are indeed quieter, mostly by virtue of moving less air.
Once they work equivalently, I’ll be happy to give up the maintenance and hassle of small gas engines.
A backpack battery model would be preferable anyway; I’m already wearing a 79.9 cm^2 engine, fuel tank, and blower on my back now. No one’s going to carry this as a handheld; all the large ones are already wearable for convenience.
For it to be a commercial success, I think you’d have to be able to run 5 hours in a day (but not all at once and battery swapping/charging on the truck from 12V would be okay).