I think that's a bit harsh on Ex Machina Caveat, the basic setup of that film does I'd agree go down paths very well trodden by this stage but it ultimately subverts that story into one about gender politics that I found a lot more interesting and relevant to its time. I would argue as well that one of the reason for the original Blade Runners greater effectiveness is that its central story is not just focused on commenting on AI and potential future issues but rather its applicability to the human condition(I know I feel pretentious typing that as well). Where as the sequel deals with the largely abstract concept of a replicant having a child as a sign of humanity and as you point out makes clumsy comments about there perceived inhumanity the original looks to tell its story vioa showing us Rachael and Roys(plus ultimately Deckards) very human storys. That makes it much easier to view those characters not just as respresenting some warning about future AI slavery but as actually stand ins for post religious humans, limited lifespans, discovering a non godlike creator who imparts no special purpose and ultimately internalised personal meaning. That does perhaps highlight differences in why different people like sci fi, personally I find it at its most effective not in exploring future scientific or social deveolpments but rather in producing a setting that can thrown drama and comment on the present day into sharper relief.