Peaky, highly strung engines are for people who haven't yet «grown up» or for on the race track where one puts up with a lot of compromises (high noise, engine only lasts a few races) (mechanics.stackexchange.com)
It caps off a pretty crazy few weeks in particular for Hartley, as he's had to dovetail these last few races with the beginnings of his F1 career. (wtf1.com)
Of course engine manufacturers will have worked on the reliability, but there's already been talk of some teams taking tactical penalties throughout the season to ensure that they don't get to the last few races and end up having to start the last few races from the back because of engine changes. (wtf1.com)