My problem isn't with the "everyone lives" trope per se, although that is very annoying on its own. My problem is that he undoes character deaths and then never revisits the characters afterwards anyway. Name of the Doctor had the Paternoster Gang killed, and revived, but then they come back for Deep Breath after that and are never seen again. The Zygon Invasion/Inversion resurrects Osgood after she was killed in Death in Heaven, but she hasn't been brought back since. Clara was killed in Face the Raven, is kind of resurrected in Hell Bent, hasn't been seen since. The Brigadier has even been resurrected, even though he was killed off because of Nicholas Courtney's actual death making it hard for him to make anymore appearances, which he hasn't since his resurrection anyway. Moffat's even been doing this to other people's scripts, even before he was showrunner, as it was because of him saying he didn't like Jenny being killed that RTD had The Doctor's Daughter re-written so that she survives, but in nearly a decade since that episode aired she hasn't been brought back.*
Moffat really has an odd thing against killing characters, indeed even after seven years running the show plus four years contributing scripts under RTD the total number of characters in a Moffat script who have died as a result of something other than old age or historical fact and have stayed dead is less than ten. But whatever, that's beside the point. I do have to wonder what is the point in resurrecting a dead character who you don't plan on using again anyway? Is there a reason they couldn't stay dead?
*I debated including Jenny, since I suspect Georgia Moffett's personal life has likely contributed to her not reprising the role, but I figured it helped sell the point anyway, so I included it anyway.