I'll agree with you wholeheartedly. This is just MHO, but Thirteen has yet to have had her "defining" Doctor moment. Matt Smith's was easy and came at the end of his first episode when he asked the Atraxi to scan him and find out who he was along with his statement "I'm the Doctor. Basically, run." Peter Capaldi had lots of defining Doctor moments, but the most memorable one to me was in "The Girl Who Died" when he figured out WHY he had the face he had. Jodie Whitaker has had a few instances of getting close to a defining moment, but I think the current trajectory of the program with it's environmental and socio-political messages, is neglecting the very reason that the Doctor is so popular and that is that he/she provides escapism, adventure and hope to the viewing public.