Interesting as personal preferences as to what autotrim should do or not do may be, I fail to understand what relevance to AF447 these have. Between 02:11:40 and 02:12:10 the PF pulled the sidestick fully back. If he had pushed the SS fully forward 30 seconds and the THS had not moved, then it would have been an issue in AF447.
HN39,
At time 02:11:40 was already mainly full NU.
The relevance is that the trim moved to that position under STALL WRN, it is
true to state that the inputs were more UP than DN :
... but is it unreasonable to think that the PF would not have manually trimmed or at least to that extent ... ?
And if he had, then I would not show up here to reply to your post.
As I said earlier, leave to the pilot that responsability to trim if that's really what he was looking for.