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GD just give us the truth. "Truth needs no defense,it is a Lion, just release it and it can defend itself"

going out on a limb here maybe, but i would say you have a dead - not dying - DEAD charging system (alternator)

an 05 could have bad wires in the 'gaiter' between the hatch and the body.

I daily drive my 2003 WRX wagon but that's not a like comparison to a 2012-14. I just ticked over 200K miles a few month back on the original, untouched engine. Plenty of small coolant hoses have needed fixed through the years and I just replaced the center diff but I can't complain about engine or turbo reliability.

Interesting - I've never had a reason to learn about roughness and its measurement (and I think this is the first time I've run into RMS used outside of an electrical/electronic/acoustic context). I would guess that there are probably relatively low-cost optical profilometers out there these days - or is this measurement capability still a pretty badass thing? Btw, spent three hours in the yard today fetching that set of three (including the one to the oil cooler) coolant hard pipes. Having to pull the manifold for the crossover tube was bad enough, but the heater return tube was trapped behind a pinch point between the head and the frame, so the engine needed a little lifting to squeeze it out. But I got 'em...

not sure it's been mentioned, but a sneak path for fuel can be the fuel pressure regulator, pull the vacuum line and see if it's wet with fuel.