2018 F150 stability/traction control question

2018 F150 3.5L 4x4 is the vehicle in question.

So, I just about wrecked this morning on an icy bridge. I was accelerating onto the highway, and the real wheels broke loose. I was expecting the traction control to kick in, as I've never so much as touched the off button on the dash. However, it never did and I had to back off the throttle and correct a slide at about 65mph.

Am I not understanding something, here? Should the traction control have come on? I assume the default setting is on, and I've never touched it.

The driving controls may exceed what I understand they can do, but ice has the trump card IMO. At most you should have noticed reduced throttle input, which I will bet you did in response to feeling the loss of control. The controls might have applied some independent wheel brake applications to counter abrupt non linear direction.
I just think all bets are off, when you get on ice.
I have a '13 SC Lariat, 3.5 2wd with 3.31 gears, electronic locking diff.