Could 'unidentified aerial phenomena' (UAPs) genuinely be non-human tech? What's the best counter-argument?

With all the recent declassifications and official reports, I'm genuinely struggling to reconcile the 'UAP' label with conventional explanations. I'm really curious to hear what the community thinks is the *most robust* scientific argument *against* the possibility of them being advanced non-human technology. I'm open to all perspectives, but really looking for solid, evidence-based reasoning here!