Happy Wife......Just the opposite for me.
I sold my 12KW PTO generator and installed an 11 KW standalone unit, which is considerably quieter than the tractor. No surprise though, the tractor is 60 HP compared to the 18 HP of the new generator.
I have to agree though. There was something comforting about that tractor diesel sound. The wife didn't care for it much, so she is happier.
An older friend of mine built his retirement house, a few years after standby Generacs got common up here. Went to visit the new place, and he fired up the gen outside manually. Impressive sound-deadening in those enclosures. All the mech/elec has to be designed/built well, but there is also serious Eng-time going into managing acoustics...... certainly also, in the nice, small suitcase gens we can get today.
Backup.... nice to Have Choices !
Rgds, D.