That's interesting.
In my professional experience I've found that the track rails/ conductors were positively glowing under load.
And they were totally exposed to the air!
When de-energized, they were WAY too hot to touch.
You could smell them cooking the plastic. And this was a 277VAC set up. (The fixture was labeled for 277VAC, too.)
Paralleling resistors causes their net resistance to drop. When the track rail is powering up purely resistive lighting loads, this axiom applies.
Consequently, ever more current rushes into the hot rail.
The general public just figures that they can lay in as many track fixtures as they might want... no problem!
That would be no different than a j-man stringing up an absurd number of fixtures on a common lighting circuit.
It's just that track lighting lends itself to such abuse.
