I prefer reliable over light, if light compromises reliability. I don't know if it always does though. I don't have the personal experience to make that call. Most of my gear would be considered heavy, but that's more due to cost than other factors usually (but not always though). I carry a heavier regular space blanket as opposed to the mylar emergency blanket (the heavier one costs more in this case). But I will also carry a HeatSheets as a backup or alternate if the situation fits.

Most of my dayhikes find me carrying my gear in a Deuter Futura 32. Most people would consider a 32 liter pack a bit much for a dayhike (I'm talking summer weather). But it comfortably holds my volumes of slightly heavier gear. The Deuter itself might be considered a fairly high-tech pack, but definitely not an ultralight one.

I can't say that I agree with your apparent choice of brawn over brains. I would prefer the brains myself. Brawn might get you further in the short term, but if the brainy guys manages to to live past the short term hazards, I'd bet my money on MacGyver rather than The Hulk for the long term. Note: Having brains does not imply that you should be out of shape though. Your cousin sounds like he might be out of shape, or, you are presenting him that way to make a point (it doesn't sound like you care for him too much). Best would be brawny brainy, but you don't see that particular combination very often.