It's a lot easier to put an effective muffler on a generator than on a leaf blower that is person-portable. I just looked at the stats for some Honda generator

It's a lot easier to put an effective muffler on a generator than on a leaf blower that is person-portable. I just looked at the stats for some Honda generators and they have a 7000-W unit with 120v and 240v outputs that runs at 52-58dB. A new mid-range California (CARB)-compliant Echo gas leaf blower comes in at 74dB.