Improbable

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Of course, although Evelyn thought it was amazing, she could still spot some of the flaws in this grade seven artifact.

The biggest flaw of 'Frozen Tears of the Ocean' was, of course, the random positioning of the escape location.

It was very unlikely, but possible, that one could be teleported right next to where they were. If that happened, it would make the whole move useless. 

Granted, the random nature of the artifact could be mitigated to an extent by keeping it in a stationary and safe position most of the time, but that was obviously impractical. 

Not only would it defeat the whole purpose of the thing being useful in emergencies — since it would be stashed away — the duration required would also be absurdly long.

Moreover, even if doing things this way reduced the probability of appearing at a 'bad' location, it would still exist. Thus, the root of the problem would still be the same.