Actually it is a burden.
The only sure way that I'm aware of that a man can get a penile yeast infection is by sexual contact with a woman.
All you've managed to prove is that there is one thing that I didn't know. Big deal. Doesn't justify circumcision. Like you said, it responded to treatment. So does athletes foot. So does jock itch. They also occur in warm, moist areas and aren't serious if treated. The next time he gets a cold, you'll wish you'd had his nose amputated at birth.