In Developer options, there is a setting called "Always allow Wi-Fi roam scans" with the description:
Always allow Wi-Fi roam scans
Allow/disallow Wi-Fi roam scans based on the amount of data traffic present at the interface
The description leads me to guess it might be useful when you are on the edge of the WiFi coverage zone, switching to another WiFi may be faster.
Googling threw up results confirming my guess on posts like this (a few more on similar lines). However, would request more explanation, since this is not encountered commonly as a suggestion to counter WiFi drops.
Is it of any use for end-users to activate it?