Back in the day when we had one flat 1/4" dot, the camera would lose track of it and your viewing experience would stutter.
Even today if using the half rounded reflectors if you move too much, you can still cause it to lose track of you.
With the Balls, it will not unless you get up and leave, but it will see you as soon as you get back.
And it takes very little if any fiddling with a profile to make it work properly.
In a bright room, you will still need to adjust filters, and or remove background reflective, and light sources. There is no getting around that even if you're using a lighted headgear.
Track IR has no brains, it only reacts to what it sees, just as our eyes do if hit by a flash from the peripheral vision.