OEM dual fan setups often just turn on the one fan at a certain temp, and when under hi load, AC on, hot weather, towing etc will turn on the other to rapidly pull heat from the rad/system.

For our cars, its the idle temps that usually are the issue, this is where the right elec fans shine.

If elec fans were crap - OEMs would not use them. They have already spent a fortune doing the R&D, the secret is to adapt the right ones, wire them correctly and make sure the Alt has enough beans to keep the system topped up.

In other words match your parts so that they work as a system