i think though because there is no talk of birth parents or adoptive parents it is completely open to interpretation.
dory isn't lost from her 'birth parents' - she is lost from her mum & dad.
every child will interpret that in a different way .
for us it was really important that we went to the cinema without our AC and watched it, after all the hype, all the bad reviews etc we were so surprised that actually for our AC we do not forsee it being a huge deal.
i agree it could be triggering - and clearly some children have struggled with it, but we've made a decision to use the story if needed as 'if you ever wandered off, or got lost in a crowd etc, we would always always find you'
and yes, we are also 8 years down the road, and our AC are older now, so maybe it also depends how far into the adoption journey the child is.
I dare say if our AC were only a year in, and maybe 5 or 6 then we wouldn't even contemplate letting them watch it - but at 9 & 11 they are desperate to go see it and so we said we'd check it out for them.