Dark Souls 2, I think you mean.
Look at it this way. In any other game, you die and all progress is lost since your last save however much time ago. In Souls games, you die, and all major enemies are still dead, all loot is still found and in your hands, all shortcuts are unlocked, and your souls are near the last place you died, still up for grabs.
These games are much more lenient than you'd think
Not to mention if you're stuck on a boss, you can always just summon another player to help kill them for you
Try losing 100k souls like I did before lol. In any case there are rings you acquire later on that can help guard against soul loss