I am another one who want to see where transfer switches are danger?
When even wood spoon can be dangerous, for years I have been camping having 2600W inverter/charger with built-in transfer switch.
Often plug into 20 or 15 amp shore power, at the moment when AC was starting, or I put oven at the same time, the shore voltage would drop and inverter would instantly switch to battery power. When the draw stabilized few seconds later it would switch back to shore power.
In drastic situation transfer switch could be switching more than 10 times per hour.
During 10 years of using it never had a problem with the animal.