as for strength - I find it much better to have real world-usable one, combined with endurance. Examples you describe are OK, but better use cases for me are - being able to climb that mountain (or just hike it), full day of of-piste skiing (its damn hard on quads) etc. In many sports, too much muscles has negative impact. For high altitude, common knowledge is that gym type muscular types struggle more up there. For climbing same. But that's me. It also brings freedom in eating - keeping huge amount of muscles while doing some 3-week effort on Aconcagua... not really possible.