May different Land Cruisers came with drive flanges (aka drive plates) as the factory installed non-option, "poor man's" vehicle.
Other models such as many of the 80 series had flanges as they are full-time 4WD and require them since adding selectable hubs would mean the vehicle would not move if they were disconnected (because of the internal center differential in the transfer case).
With the LJ, KZJ, and HZJ models (mostly from Japan) that had factory installed electric locking hubs, the bearing hubs (the part the brake rotor and wheel bolts to) are too short to permit adding a drive flange.
As for recommending a drive flange... nah, not really a good idea when there are good manual locking hubs to choose from.
The only "harms" from running a drive flange are that you're turning all the parts in the front end all the time. You will have added vibration, reduced fuel economy, somewhat increased wear etc.
~John