Radaceus
Adventurer
Neither Teleport Without Error (3E), nor its sequel Greater Teleport(3.5) allowed interplaner travel. I dont know about 4E, but i've just looked it up in my PHBs because that one was news to me 
As far as I know, Until the 5E version, Spell jamming was the only way as stated, Plane shift allowed for travel between planes, but not between worlds.
I as of yet have not had to deal with it, though I have written up some higher level content to take my 5E group past 12-15th level, and in that added some teleportation circles as well incorporated the Infinite Staircase (among other Planescape content). Toying with the idea of nearby planets accessible in this way, ancient creator race type thing.
I do not feel it is game breaking as of yet, since the caster needs to know the place they are teleporting to. Granted once known, via a telportation circle or spelljamming, possibly through contact another plane or some such divination, then said caster is good to go.
Anyhow, more on topic.
Our group has all of the boxed sets in question ( except Dark Sun, and Eberron), and heaps of the old modules. We used Menzoberranzan in conjunction with Greyhawk, we used Oriental Adventures on a new continent of FR, the list goes on. Mainly because we just gleamed what we wanted, imposed our own pantheons(Usually straight from (Deities and Demi-Gods, or Legends and Lore), maybe created our own homebrew and scalped what we wanted from all of the above. It's never been a problem.
FR is a nice tool, because for the layman, you can use the wiki and you've got your world built. Greyhawk requires a little more from a DM, and obviously homebrewing (building your world campaign from scratch) requires more again. I see having more settings as a boon. I doubt our group will ever set foot in Ravnica, or Eberon for that matter, but i guarantee we will scalp some ideas from them.

As far as I know, Until the 5E version, Spell jamming was the only way as stated, Plane shift allowed for travel between planes, but not between worlds.
I as of yet have not had to deal with it, though I have written up some higher level content to take my 5E group past 12-15th level, and in that added some teleportation circles as well incorporated the Infinite Staircase (among other Planescape content). Toying with the idea of nearby planets accessible in this way, ancient creator race type thing.
I do not feel it is game breaking as of yet, since the caster needs to know the place they are teleporting to. Granted once known, via a telportation circle or spelljamming, possibly through contact another plane or some such divination, then said caster is good to go.
Anyhow, more on topic.
Our group has all of the boxed sets in question ( except Dark Sun, and Eberron), and heaps of the old modules. We used Menzoberranzan in conjunction with Greyhawk, we used Oriental Adventures on a new continent of FR, the list goes on. Mainly because we just gleamed what we wanted, imposed our own pantheons(Usually straight from (Deities and Demi-Gods, or Legends and Lore), maybe created our own homebrew and scalped what we wanted from all of the above. It's never been a problem.
FR is a nice tool, because for the layman, you can use the wiki and you've got your world built. Greyhawk requires a little more from a DM, and obviously homebrewing (building your world campaign from scratch) requires more again. I see having more settings as a boon. I doubt our group will ever set foot in Ravnica, or Eberon for that matter, but i guarantee we will scalp some ideas from them.