I’d love to be a fly on the wall of the engineer having to solve this.
The Liberty 2 Pro are due an upgrade next, logically (I have no inside knowledge,just speculation).
The last picture shows what is inside 1st and 2nd picture, an armature and then driver.
To add ANC would involve placing a microphone between the grill and the armature and for it to not wrattle, and for the whole unit to still fit in the ear and not have increased tendency to fall out.
I suspect the LA2P could be released before the L2P successor because the LA2P doesn’t have an armature, there’s less total length of speaker in the ear canal, so easier to fit in a microphone.
Adding ANC but with worse sound quality is trivial, but to add ANC and to improve quality, and for it be an attractive price, lovely engineering problem to solve.
The reviews of the LA2, LA2P and L2P still seem to favour the L2P for audio quality so it’s the kind still but its lack of ANC is the the next problem.