Dear @bola I'm an educated footspecialist in Denmark. I will both confirm and unconfirm your advice.

Socks are sweatabsorbing and prevent smelly feet, but can give a greater risk of fungus between your toes. If you really do want to use socks in your sandals. Then my advice to you is to use toesocks.

You also mention it doesn't spread nailfungus and at this point you are correct, but it worsens the fungus in nails. Because as you probably already know fungus thrives best in moisture,dark and bad oxygenated environment.