I'm just talking to husband again about this (because... he's still very disappointed and this is all talk therapy for him), and I mentioned how I thought the best Doctor who episodes are always the ones where there is disturbing mild peril.
He says the last time he remembers that happening is the season finale with the Master and Missy and Capaldi (World Enough and Time or something) where they - work in progress cybermen - are wearing burns victim facial bandages/masks and they are sitting there silent, and Bill Potts turns up the volume and they are all saying "pain pain pain" and then it just casually gets turned back down again, disturbingly.
He says it properly freaked him out even as an adult, and that we are missing that kind of grim stuff, because especially now with the world, Who has always been an ramped up version of what humanity can do and its more important now than 10 or 20 years ago, and instead we're just getting identity fluff.