Yeah.. But.. When you are hiking around up over 10,000' every ounce saved helps you out a lot. That's why I went with the 3xx series.
Ya' but if it decides to self-destruct when you need it you won’t be very far ahead.
An all-steel, J-frame model 36 weighs 19 oz. The steel/aluminum model 37 weighs 14 oz. That’s about 2 oz. More then a similar 3xxx. Even at 10,000 feet you should be able to handle the difference.
At any altitude I judge absolute, unquestioned – and proven – reliability to be more important then weight. Your mileage may very.