My thinking on duty cycle for the home/hobbyist user, its just a CYA rating for the manufacturer in full commercial use, which I understand. I suspect its also very ambient air temp related/factored, and wonder if the machines have an internal temp sensor that shuts it down if one goes way over aboard on Duty cycle. If that happens often, the user is obviously pushing the machine, otherwise, I would not worry about duty cycle.

Anybody have any downsides to inverter use machines in home settings, like "noise" in the electrical circuits effecting computers, etc?

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.