Ruin Explorer
Legend
Rule 0 is a thing, so by your logic there, it could literally say Eberron is on the other side of Toril and it wouldn't actually impact my game at the table because I'd say "no it isn't". 
You seem to think the Great Wheel and the D&D multiverse are interchangeable. Cool. 5E thinks otherwise. It specifies otherwise. It goes out of its way to do so.
Re connections, that's just a lot of pretty waffle. It is literally without meaning AFAICT so I'm not sure what response you expect. /shrug
My issue is that Eberron was specifically and intentionally created to diverge from a lot of D&D "traditions". Being in a different cosmology was part of that. A profound part of it, actually. 5E claimed to respect and allow for different cosmologies. Indeed, the DMG has a whole big bit on it. They know it matters, even if you imply it doesn't. So by changing this fundamental part of Eberron, seemingly simply to vaguely encourage cross-sales which would likely happen anyway, they're showing that was a hollow sentiment, and this recontextualisation seems significant to me (and them, I would argue - why do something like this otherwise?). Will it to everyone? No. As I said, they could literally say Eberron was on Toril and people here would be defending that and saying just rule 0 it.

You seem to think the Great Wheel and the D&D multiverse are interchangeable. Cool. 5E thinks otherwise. It specifies otherwise. It goes out of its way to do so.
Re connections, that's just a lot of pretty waffle. It is literally without meaning AFAICT so I'm not sure what response you expect. /shrug
My issue is that Eberron was specifically and intentionally created to diverge from a lot of D&D "traditions". Being in a different cosmology was part of that. A profound part of it, actually. 5E claimed to respect and allow for different cosmologies. Indeed, the DMG has a whole big bit on it. They know it matters, even if you imply it doesn't. So by changing this fundamental part of Eberron, seemingly simply to vaguely encourage cross-sales which would likely happen anyway, they're showing that was a hollow sentiment, and this recontextualisation seems significant to me (and them, I would argue - why do something like this otherwise?). Will it to everyone? No. As I said, they could literally say Eberron was on Toril and people here would be defending that and saying just rule 0 it.