Landing lights are absolute necessity and are a standard on all helicopters like it was mentioned.
No one lands with a FLIR, all FLIR's have digital or optical zoom which makes it hard to land with them especially since you can not overlook the ground when it is zoomed in right beneath you. NVG of helmets have also a problem, they only cover a smaller field of view than the human eye and the green spectrum distorts the field of depth which makes it difficulter to land.
It obligates to the pilot if he uses NVG or Landing Light or like the rest of the pilots they see the remaining light as sufficient.