The experience I described was in Oct 2016, before the iOS update in Feb 2017 which introduced the throttling, and fixed the unexpected shutdowns for me. At th

The experience I described was in Oct 2016, before the iOS update in Feb 2017 which introduced the throttling, and fixed the unexpected shutdowns for me. At the time they just refused to even consider the possibility it was a genuine hardware issue. I got the lecture about batteries being consumable items, mine was somewhat degraded (82% health), etc. They suggested I do a software reset, etc. I like to think maybe in hindsight someone at Apple HQ looked at the diagnostics from my Genius Bar visit as part of the decision to introduce throttling, and realised they were wrong.