Not world breaking, but definitely world shaping.
Thera are all kinds of hidden factors in the rise & fall of empires: Europe and Asia had a wider variety of domesticable animals than Africa; the extensive use of lead in Roman ceramics used to transport water and serve foods; the invention of the stirrup...
Teleportation, even limited by a "recharge" time, is a powerful tool.
Consider an eladrin sniper in his world's version of Stalingrad. He'll have a thorough understanding of his terrain, so will be aware of all kinds of perches and pathways. Once he has enemies in his LoF, he not only has all the standard options of engagement and disengagement, but every 5 minutes, can be 30' away from where you expect him to be, in any direction. That is not trivial.
Thera are all kinds of hidden factors in the rise & fall of empires: Europe and Asia had a wider variety of domesticable animals than Africa; the extensive use of lead in Roman ceramics used to transport water and serve foods; the invention of the stirrup...
Teleportation, even limited by a "recharge" time, is a powerful tool.
Consider an eladrin sniper in his world's version of Stalingrad. He'll have a thorough understanding of his terrain, so will be aware of all kinds of perches and pathways. Once he has enemies in his LoF, he not only has all the standard options of engagement and disengagement, but every 5 minutes, can be 30' away from where you expect him to be, in any direction. That is not trivial.