system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU][Endgame Spoilers] What's so special about the Soul Stone?

So, who knows where these things were originally, but the earliest appearance of the Space Stone is in some viking temple in Norway, not some weird non-Euclidean spatial configuration. 

The Reality Stone is just a weird pool of goo and all you have to do to get it is touch it, apparently. You don't have to pierce the veil and see through an impenetrable illusion or something.

We don't know where Thanos originally got the Mind Stone, but there's no indication he had to solve an impossible riddle, and if he did, no one else had to after that.

I could go on, but there's no indication that any of the other Infinity Gems have *one weird trick* that you have to use to get them, but the Soul Stone can apparently only be obtained by sacrificing the thing you love most, and it apparently even has the power to enslave a former wielder of the Space Stone as a tour guide. So what makes the Soul Stone so special that it gets its owner creepy guardian and fancy rules about how to get it?
gpt
No one had to go through a non-euclidean test of sacrifice and death in order to get the Soul Stone *after* it was removed from Vormir, either. Just grabbing it worked just the same as with every other stone, once it was "out of the box". 

Vormir and the "Drop One Loved One For Access" puzzle was just where the thing had been hidden for so long that no one remembered where it had been put. Similar to how the Reality Stone was in a gap between space and time for a very, very, very long time, and the Space Stone was buried in the Arctic ice pack for a few years there.