So the entirety of Con in noncombat is Endurance? I still call that pretty poor. Yes, Con was important in 3E and 4E because you could essentially ignore 3 or 4 stats. In 5E, all stats are supposed to be important. So I see Charisma being added to the grownup's table but Con going down to the kid's table because you can actively use Chr, you can see a situation and say, "I'm going to use my personality to solve this." But Con? "I'm going to hold breath until I get my way?"
It's not about the DM providing useful challenges for Con, because the DM shouldn't be deciding how characters approach a problem. Con is piss-poor for approaching problems. Think about it from the perspective of 5E's open skill system. You get assigned skills that aren't part of a chart and get to add +2 if you can reasonably use that skill in a situation. How many Con-based skills could there possibly be that aren't just copies of "I hold my breath?"
It's not about the DM providing useful challenges for Con, because the DM shouldn't be deciding how characters approach a problem. Con is piss-poor for approaching problems. Think about it from the perspective of 5E's open skill system. You get assigned skills that aren't part of a chart and get to add +2 if you can reasonably use that skill in a situation. How many Con-based skills could there possibly be that aren't just copies of "I hold my breath?"