How much do I care about bike weight? Not that much. Most modern carbon (or aluminum) race bikes are not going to hold me back in any real world competitive situation. I'm 66 kg and about 310-315 w FTP when I'm going good, but I've never been a big FTP guy and at my level I'm certainly not a climber. I have an easier time pushing my self when I'm feeling some speed, and prefer over/under type efforts like breakaways and TTT. My biggest goals over the last couple yeas have been TTT related.
If I was better at climbing, I might mind bike weight a bit more, but I'm not so, meh.
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"Your beauty is an aeroplane;
so high, my heart cannot bear the strain." -A.C. Jobim, Triste