You can make some properly bad lightweight bikes. Out of all the bikes I've ridden, the ones I've enjoyed the most and kept the longest have been mid-range butted steel.
Besides, a bike that fits and is comfortable are both much more important than one that is just light, which is why (a) modern bikes aren't chasing weight in the same way they did in the nineties and (b) you see so many unridden nineties mountain bikes.
Agreed - it's largely an enthusiasts obsession, rather than anything on true merit - else the enthusiasts would always be at their ideal fighting weight.
Spending time, money, effort on obsessive lightness in your equipment, when some may be carrying several pounds, perhaps stones in bodyweight more than is ideal, is just missing the woods for the trees, in that special way that middle aged men, with money to burn, and time to fill, do.
Not that there's anything wrong with that - far from it - but unless you're applying the same rationale to yourself, it's a bit of a toothless artifact. Don't get me wrong, a reasonably light bike tends to be more pleasurable to lug about - I'm not suggesting otherwise - but to focus on it, without consideration to your own weight, is shortsighted, too. Put it this way, a nice, light-ish bike can be perceived when riding, but nothing feels better, when you're riding, than to be fit and in shape, too.
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