Originally Posted by
Aubergine
I also cast a careful eye at those 3TTT slits. Notice that the slit does not end abruptly; the metal at the inside of the slit angles out toward the outer edge of the seatpost. (You can just see the angled bit at the top of the slit in the OP's photo). Seems to me that this diminishes the stress risers that the old AVA and other stems had.
most notably, the AVA and Pivo stems were cast Aluminium, the 3T ones are forged. totally different wheelhouse.
If you are still worried, it is no problem to add the stress relieve hole yourself, as long as you are meticulous about deburring.