The rake and stem angle is perfect for the toughest of climbs and switchbacks. However, I'll probably be up to 21.6 lbs. I take the time to do a two hour tough ride almost every day of the ridable year. In my estimation I have in excess of 10,000 hard single track miles on this frame. If something happened to this one and couldn't get another, I'd kidnap Chris Chance and force him build me one.
Most people have other priorities for their money and time.
If you are only going to ride on weekends and then not that often, you can spend a third as much and have a very servicable machine. My thinking is to buy the very best frame that you can afford. Add to that less expensive parts and as they wear out replace them with parts that will last longer and are lighter. Weight is an important factor, but not something you should become obsessed about. Other companies make good frames also, but I' ve just never ridden them.